[Bug]: Legacy Skins mod causes crash at startup

[Mahir007]

What is the issue?

Game crashes when the optional Legacy Skins mod is installed.

To Reproduce

Download version 0.9.0 of the modpack for minecraft 1.20.1 and explicitly select the optional 'Legacy Skins' mod. Then, attempt to launch the game.

Minecraft Version

1.20.1

Re-Console Version

0.9.0

Log

---- Minecraft Crash Report ----
// My bad.

Time: 2025-01-23 20:09:04
Description: Unexpected error

java.lang.RuntimeException: Mixin transformation of wily.legacy.client.screen.RenderableVList failed
at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:427)
at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:323)
at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218)
at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:119)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:525)
at knot//net.minecraft.class_442.(class_442.java:79)
at knot//net.minecraft.class_442.(class_442.java:75)
at knot//net.minecraft.class_442.(class_442.java:71)
at knot//net.minecraft.class_310.mdf92253$legacy$lambda$addInitialScreens$2$1(class_310.java:15257)
at knot//wily.factoryapi.base.network.CommonNetwork$SecureExecutor.lambda$createBooleanRunnable$1(CommonNetwork.java:72)
at java.base/java.util.concurrent.ConcurrentLinkedQueue.bulkRemove(ConcurrentLinkedQueue.java:1004)
at java.base/java.util.concurrent.ConcurrentLinkedQueue.removeIf(ConcurrentLinkedQueue.java:964)
at knot//wily.factoryapi.base.network.CommonNetwork$SecureExecutor.executeAll(CommonNetwork.java:52)
at knot//wily.factoryapi.FactoryAPIClient.lambda$init$0(FactoryAPIClient.java:160)
at knot//net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientTickEvents.lambda$static$0(ClientTickEvents.java:34)
at knot//net.minecraft.class_310.handler$bpf000$fabric-lifecycle-events-v1$onStartTick(class_310.java:9017)
at knot//net.minecraft.class_310.method_1574(class_310.java)
at knot//net.minecraft.class_310.method_1523(class_310.java:1181)
at knot//net.minecraft.class_310.method_1514(class_310.java:802)
at knot//net.minecraft.client.main.Main.main(Main.java:250)
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:480)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)
at org.prismlauncher.launcher.impl.StandardLauncher.launch(StandardLauncher.java:105)
at org.prismlauncher.EntryPoint.listen(EntryPoint.java:129)
at org.prismlauncher.EntryPoint.main(EntryPoint.java:70)
Caused by: org.spongepowered.asm.mixin.transformer.throwables.MixinTransformerError: An unexpected critical error was encountered
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:392)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:234)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:202)
at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:422)
... 25 more
Caused by: org.spongepowered.asm.mixin.throwables.MixinApplyError: Mixin [legacyskins.mixins.json:legacy4j.RenderableVListAccessor from mod legacyskins] from phase [DEFAULT] in config [legacyskins.mixins.json] FAILED during APPLY
at org.spongepowered.asm.mixin.transformer.MixinProcessor.handleMixinError(MixinProcessor.java:638)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.handleMixinApplyError(MixinProcessor.java:589)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:379)
... 28 more
Caused by: org.spongepowered.asm.mixin.gen.throwables.InvalidAccessorException: No candidates were found matching scrolledList:Lwily/legacy/util/Stocker; in wily/legacy/client/screen/RenderableVList for legacyskins.mixins.json:legacy4j.RenderableVListAccessor from mod legacyskins->@Accessor[FIELD_GETTER]::getScrolledList()Lwily/legacy/util/Stocker; [ACCESSOR Applicator Phase -> legacyskins.mixins.json:legacy4j.RenderableVListAccessor from mod legacyskins -> Apply Accessors -> -> Locate -> legacyskins.mixins.json:legacy4j.RenderableVListAccessor from mod legacyskins->@Accessor[FIELD_GETTER]::getScrolledList()Lwily/legacy/util/Stocker;]
at org.spongepowered.asm.mixin.gen.AccessorInfo.findTarget(AccessorInfo.java:519)
at org.spongepowered.asm.mixin.gen.AccessorInfo.findTargetField(AccessorInfo.java:502)
at org.spongepowered.asm.mixin.gen.AccessorInfo.locate(AccessorInfo.java:476)
at org.spongepowered.asm.mixin.transformer.MixinTargetContext.generateAccessors(MixinTargetContext.java:1517)
at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.applyAccessors(MixinApplicatorStandard.java:761)
at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.applyMixin(MixinApplicatorStandard.java:320)
at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.apply(MixinApplicatorStandard.java:246)
at org.spongepowered.asm.mixin.transformer.TargetClassContext.apply(TargetClassContext.java:437)
at org.spongepowered.asm.mixin.transformer.TargetClassContext.applyMixins(TargetClassContext.java:418)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:363)
... 28 more

A detailed walkthrough of the error, its code path and all known details is as follows:

-- Head --
Thread: Render thread
Stacktrace:
at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:427)
at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:323)
at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218)
at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:119)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:525)
at knot//net.minecraft.class_442.(class_442.java:79)
at knot//net.minecraft.class_442.(class_442.java:75)
at knot//net.minecraft.class_442.(class_442.java:71)
at knot//net.minecraft.class_310.mdf92253$legacy$lambda$addInitialScreens$2$1(class_310.java:15257)
at knot//wily.factoryapi.base.network.CommonNetwork$SecureExecutor.lambda$createBooleanRunnable$1(CommonNetwork.java:72)
at java.base/java.util.concurrent.ConcurrentLinkedQueue.bulkRemove(ConcurrentLinkedQueue.java:1004)
at java.base/java.util.concurrent.ConcurrentLinkedQueue.removeIf(ConcurrentLinkedQueue.java:964)
at knot//wily.factoryapi.base.network.CommonNetwork$SecureExecutor.executeAll(CommonNetwork.java:52)
at knot//wily.factoryapi.FactoryAPIClient.lambda$init$0(FactoryAPIClient.java:160)
at knot//net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientTickEvents.lambda$static$0(ClientTickEvents.java:34)
at knot//net.minecraft.class_310.handler$bpf000$fabric-lifecycle-events-v1$onStartTick(class_310.java:9017)

-- Last reload --
Details:
Reload number: 1
Reload reason: initial
Finished: Yes
Packs: vanilla, fabric, legacy:console_aspects, legacy:legacy_waters, file/Legacy-Skin-Packs.zip, file/TutorialWorldAddon.zip, file/rcr1.20.1.zip
Stacktrace:
at knot//net.minecraft.class_6360.method_36565(class_6360.java:49)
at knot//net.minecraft.class_310.method_1587(class_310.java:2413)
at knot//net.minecraft.class_310.method_1514(class_310.java:826)
at knot//net.minecraft.client.main.Main.main(Main.java:250)
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:480)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)
at org.prismlauncher.launcher.impl.StandardLauncher.launch(StandardLauncher.java:105)
at org.prismlauncher.EntryPoint.listen(EntryPoint.java:129)
at org.prismlauncher.EntryPoint.main(EntryPoint.java:70)

-- System Details --
Details:
Minecraft Version: 1.20.1
Minecraft Version ID: 1.20.1
Operating System: Windows 11 (amd64) version 10.0
Java Version: 17.0.8, Microsoft
Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Microsoft
Memory: 1736479096 bytes (1656 MiB) / 2315255808 bytes (2208 MiB) up to 8589934592 bytes (8192 MiB)
CPUs: 12
Processor Vendor: AuthenticAMD
Processor Name: AMD Ryzen 5 3600X 6-Core Processor
Identifier: AuthenticAMD Family 23 Model 113 Stepping 0
Microarchitecture: Zen 2
Frequency (GHz): 3.79
Number of physical packages: 1
Number of physical CPUs: 6
Number of logical CPUs: 12
Graphics card #0 name: Parsec Virtual Display Adapter
Graphics card #0 vendor: Parsec Cloud, Inc.
Graphics card #0 VRAM (MB): 0.00
Graphics card #0 deviceId: unknown
Graphics card #0 versionInfo: DriverVersion=0.45.0.0
Graphics card #1 name: NVIDIA GeForce GTX 1050 Ti
Graphics card #1 vendor: NVIDIA (0x10de)
Graphics card #1 VRAM (MB): 4095.00
Graphics card #1 deviceId: 0x1c82
Graphics card #1 versionInfo: DriverVersion=32.0.15.6636
Memory slot #0 capacity (MB): 8192.00
Memory slot #0 clockSpeed (GHz): 3.60
Memory slot #0 type: DDR4
Memory slot #1 capacity (MB): 8192.00
Memory slot #1 clockSpeed (GHz): 3.60
Memory slot #1 type: DDR4
Memory slot #2 capacity (MB): 8192.00
Memory slot #2 clockSpeed (GHz): 3.60
Memory slot #2 type: DDR4
Memory slot #3 capacity (MB): 8192.00
Memory slot #3 clockSpeed (GHz): 3.60
Memory slot #3 type: DDR4
Virtual memory max (MB): 47517.59
Virtual memory used (MB): 37220.58
Swap memory total (MB): 14848.00
Swap memory used (MB): 744.91
JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xms512m -Xmx8192m
Fabric Mods:
animatica: Animatica 0.6.1+1.20.4
architectury: Architectury 9.2.14
audaki_cart_engine: Audaki Cart Engine 3.1.1
badoptimizations: BadOptimizations 2.2.1
betterf3: BetterF3 7.0.2
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bobby: Bobby 5.0.1
com_typesafe_config: config 1.4.2
io_leangen_geantyref_geantyref: geantyref 1.3.13
org_spongepowered_configurate-core: configurate-core 4.1.2
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c2me: Concurrent Chunk Management Engine 0.2.0+alpha.11.13
c2me-base: Concurrent Chunk Management Engine (Base) 0.2.0+alpha.11.13
c2me-client-uncapvd: Concurrent Chunk Management Engine (Client/Uncap View Distance) 0.2.0+alpha.11.13
c2me-fixes-chunkio-threading-issues: Concurrent Chunk Management Engine (Fixes/Chunk IO/Threading Issues) 0.2.0+alpha.11.13
c2me-fixes-general-threading-issues: Concurrent Chunk Management Engine (Fixes/General/Threading Issues) 0.2.0+alpha.11.13
c2me-fixes-worldgen-threading-issues: Concurrent Chunk Management Engine (Fixes/WorldGen/Threading Issues) 0.2.0+alpha.11.13
c2me-fixes-worldgen-vanilla-bugs: Concurrent Chunk Management Engine (Fixes/WorldGen/Vanilla Bugs) 0.2.0+alpha.11.13
c2me-notickvd: Concurrent Chunk Management Engine (No Tick View Distance) 0.2.0+alpha.11.13
c2me-opts-allocs: Concurrent Chunk Management Engine (Optimizations/Memory Allocations) 0.2.0+alpha.11.13
c2me-opts-chunk-access: Concurrent Chunk Management Engine (Optimizations/Chunk Access) 0.2.0+alpha.11.13
c2me-opts-chunkio: Concurrent Chunk Management Engine (Optimizations/Chunk IO) 0.2.0+alpha.11.13
c2me-opts-math: Concurrent Chunk Management Engine (Optimizations/Math) 0.2.0+alpha.11.13
c2me-opts-scheduling: Concurrent Chunk Management Engine (Optimizations/Scheduling) 0.2.0+alpha.11.13
c2me-opts-worldgen-general: Concurrent Chunk Management Engine (Optimizations/General WorldGen) 0.2.0+alpha.11.13
c2me-opts-worldgen-vanilla: Concurrent Chunk Management Engine (Optimizations/Vanilla WorldGen) 0.2.0+alpha.11.13
c2me-rewrites-chunk-serializer: Concurrent Chunk Management Engine (Rewrites/Chunk Serializer) 0.2.0+alpha.11.13
c2me-rewrites-chunkio: Concurrent Chunk Management Engine (Rewrites/Chunk IO) 0.2.0+alpha.11.13
c2me-server-utils: Concurrent Chunk Management Engine (Server Utils) 0.2.0+alpha.11.13
c2me-threading-chunkio: Concurrent Chunk Management Engine (Threading/WorldGen) 0.2.0+alpha.11.13
c2me-threading-lighting: Concurrent Chunk Management Engine (Threading/Lighting) 0.2.0+alpha.11.13
c2me-threading-worldgen: Concurrent Chunk Management Engine (Threading/WorldGen) 0.2.0+alpha.11.13
com_electronwill_night-config_core: core 3.6.5
com_electronwill_night-config_toml: toml 3.6.5
com_ibm_async_asyncutil: asyncutil 0.1.0
net_objecthunter_exp4j: exp4j 0.4.8
org_threadly_threadly: threadly 7.0
calcmod: CalcMod fabric-1.20-1.3.0
clientarguments: clientarguments 1.5.1
org_mariuszgromada_math_mathparser_org-mxparser: MathParser.org-mXparser 5.0.6
chat_heads: Chat Heads 0.13.7
citresewn: CIT Resewn 1.2.2+1.20.1
citresewn-defaults: CIT Resewn: Defaults 1.2.2+1.20.1
cloth-config: Cloth Config v11 11.1.136
cloth-basic-math: cloth-basic-math 0.6.1
continuity: Continuity 3.0.0+1.20.1
cpm: Customizable Player Models 0.6.19a
craftpresence: CraftPresence 2.5.2
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cubes-without-borders: Cubes Without Borders 3.0.0+mc1.20
cull-less-leaves: Cull Less Leaves 1.4.2+1.21-fabric
debugify: Debugify 1.20.1+2.0
dynamic_fps: Dynamic FPS 3.7.7
net_lostluma_battery: battery 1.3.0
e4mc_minecraft: e4mc 5.2.1
folk_sisby_kaleido-config: kaleido-config 0.3.1+1.3.1
ears: Ears 1.4.6
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fabric-biome-api-v1: Fabric Biome API (v1) 13.0.13+1802ada577
fabric-block-api-v1: Fabric Block API (v1) 1.0.11+1802ada577
fabric-block-view-api-v2: Fabric BlockView API (v2) 1.0.1+1802ada577
fabric-blockrenderlayer-v1: Fabric BlockRenderLayer Registration (v1) 1.1.41+1802ada577
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fabric-dimensions-v1: Fabric Dimensions API (v1) 2.1.54+1802ada577
fabric-entity-events-v1: Fabric Entity Events (v1) 1.6.0+1c78457f77
fabric-events-interaction-v0: Fabric Events Interaction (v0) 0.6.2+1802ada577
fabric-events-lifecycle-v0: Fabric Events Lifecycle (v0) 0.2.63+df3654b377
fabric-game-rule-api-v1: Fabric Game Rule API (v1) 1.0.40+1802ada577
fabric-item-api-v1: Fabric Item API (v1) 2.1.28+1802ada577
fabric-item-group-api-v1: Fabric Item Group API (v1) 4.0.12+1802ada577
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fabric-lifecycle-events-v1: Fabric Lifecycle Events (v1) 2.2.22+1802ada577
fabric-loot-api-v2: Fabric Loot API (v2) 1.2.1+1802ada577
fabric-loot-tables-v1: Fabric Loot Tables (v1) 1.1.45+9e7660c677
fabric-message-api-v1: Fabric Message API (v1) 5.1.9+1802ada577
fabric-mining-level-api-v1: Fabric Mining Level API (v1) 2.1.50+1802ada577
fabric-model-loading-api-v1: Fabric Model Loading API (v1) 1.0.3+1802ada577
fabric-models-v0: Fabric Models (v0) 0.4.2+9386d8a777
fabric-networking-api-v1: Fabric Networking API (v1) 1.3.11+1802ada577
fabric-networking-v0: Fabric Networking (v0) 0.3.51+df3654b377
fabric-object-builder-api-v1: Fabric Object Builder API (v1) 11.1.3+1802ada577
fabric-particles-v1: Fabric Particles (v1) 1.1.2+1802ada577
fabric-recipe-api-v1: Fabric Recipe API (v1) 1.0.21+1802ada577
fabric-registry-sync-v0: Fabric Registry Sync (v0) 2.3.3+1802ada577
fabric-renderer-api-v1: Fabric Renderer API (v1) 3.2.1+1802ada577
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fabric-renderer-registries-v1: Fabric Renderer Registries (v1) 3.2.46+df3654b377
fabric-rendering-data-attachment-v1: Fabric Rendering Data Attachment (v1) 0.3.37+92a0d36777
fabric-rendering-fluids-v1: Fabric Rendering Fluids (v1) 3.0.28+1802ada577
fabric-rendering-v0: Fabric Rendering (v0) 1.1.49+df3654b377
fabric-rendering-v1: Fabric Rendering (v1) 3.0.8+1802ada577
fabric-resource-conditions-api-v1: Fabric Resource Conditions API (v1) 2.3.8+1802ada577
fabric-screen-api-v1: Fabric Screen API (v1) 2.0.8+1802ada577
fabric-screen-handler-api-v1: Fabric Screen Handler API (v1) 1.3.30+1802ada577
fabric-sound-api-v1: Fabric Sound API (v1) 1.0.13+1802ada577
fabric-transfer-api-v1: Fabric Transfer API (v1) 3.3.5+8dd72ea377
fabric-transitive-access-wideners-v1: Fabric Transitive Access Wideners (v1) 4.3.1+1802ada577
fabric-language-kotlin: Fabric Language Kotlin 1.13.0+kotlin.2.1.0
org_jetbrains_kotlin_kotlin-reflect: kotlin-reflect 2.1.0
org_jetbrains_kotlin_kotlin-stdlib: kotlin-stdlib 2.1.0
org_jetbrains_kotlin_kotlin-stdlib-jdk7: kotlin-stdlib-jdk7 2.1.0
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org_jetbrains_kotlinx_kotlinx-coroutines-jdk8: kotlinx-coroutines-jdk8 1.9.0
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org_jetbrains_kotlinx_kotlinx-io-bytestring-jvm: kotlinx-io-bytestring-jvm 0.6.0
org_jetbrains_kotlinx_kotlinx-io-core-jvm: kotlinx-io-core-jvm 0.6.0
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org_jetbrains_kotlinx_kotlinx-serialization-core-jvm: kotlinx-serialization-core-jvm 1.7.3
org_jetbrains_kotlinx_kotlinx-serialization-json-jvm: kotlinx-serialization-json-jvm 1.7.3
fabricloader: Fabric Loader 0.16.9
mixinextras: MixinExtras 0.4.1
fabricskyboxes: FabricSkyBoxes 0.7.3+mc1.20.1
factory_api: Factory API 2.2
team_reborn_energy: Energy 2.3.0
ferritecore: FerriteCore 6.0.1
forgeconfigapiport: Forge Config API Port 8.0.1
fsb-interop: FabricSkyBoxes Interop 1.3.6+mc1.20.1-build.50
immediatelyfast: ImmediatelyFast 1.3.3+1.20.4
net_lenni0451_reflect: Reflect 1.3.4
indium: Indium 1.0.34+mc1.20.1
infinite-music: Infinite Music 0.3.0
iris: Iris 1.7.5+mc1.20.1
io_github_douira_glsl-transformer: glsl-transformer 2.0.1
org_anarres_jcpp: jcpp 1.4.14
org_antlr_antlr4-runtime: antlr4-runtime 4.13.1
java: OpenJDK 64-Bit Server VM 17
legacy: Legacy4J 1.7.7
dev_isxander_libsdl4j: libsdl4j 3.preview-3.1.3-46
legacy-mipmaps: Legacy Mipmaps 1.2.2
legacyskins: Legacy Skins 1.3.0+fabric+1.20.1
lithium: Lithium 0.11.2
macos_input_fixes: MacOS Input Fixes 1.8
minecraft: Minecraft 1.20.1
modelfix: Model Gap Fix 1.15
moderner_beta: Moderner Beta 2.1.2+1.20.1
modernfix: ModernFix 5.20.0+mc1.20.1
modmenu: Mod Menu 7.2.2
no-resource-pack-warnings: No Resource Pack Warnings 1.3.0
nochatreports: No Chat Reports 1.20.1-v2.2.2
noisium: Noisium 2.3.0+mc1.20-1.20.1
nostalgic_tweaks: Nostalgic Tweaks 2.0.0-beta.903
oldmclogo: Old MC Logo 1.1.0
optigui: OptiGUI 2.3.0-beta.6+1.20
org_apache_commons_commons-text: commons-text 1.11.0
org_ini4j_ini4j: ini4j 0.5.4
owo: oωo 0.11.2+1.20
proplacer: Pro Placer 8.0.2
puzzleslib: Puzzles Lib 8.1.25
puzzlesaccessapi: Puzzles Access Api 8.0.7
reeses-sodium-options: Reese's Sodium Options 1.7.2+mc1.20.1-build.101
servercore: ServerCore 1.5.2+1.20.1
fabric-permissions-api-v0: fabric-permissions-api 0.3.1
org_yaml_snakeyaml: snakeyaml 2.2
placeholder-api: Placeholder API 2.1.3+1.20.1
space_arim_dazzleconf_dazzleconf-core: dazzleconf-core 1.3.0-M2
space_arim_dazzleconf_dazzleconf-ext-snakeyaml: dazzleconf-ext-snakeyaml 1.3.0-M2
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sodium-extra: Sodium Extra 0.5.4+mc1.20.1-build.115
caffeineconfig: CaffeineConfig 1.3.0+1.17
crowdin-translate: CrowdinTranslate 1.4+1.19.3
sspb: Sodium Shadowy Path Blocks 3.4.1
threadtweak: ThreadTweak 1.20.2-0.1.1
unilib: UniLib 1.0.4
vmp: Very Many Players 0.2.0+beta.7.102
yet_another_config_lib_v3: YetAnotherConfigLib 3.6.2+1.20.1-fabric
com_twelvemonkeys_common_common-image: common-image 3.12.0
com_twelvemonkeys_common_common-io: common-io 3.12.0
com_twelvemonkeys_common_common-lang: common-lang 3.12.0
com_twelvemonkeys_imageio_imageio-core: imageio-core 3.12.0
com_twelvemonkeys_imageio_imageio-metadata: imageio-metadata 3.12.0
com_twelvemonkeys_imageio_imageio-webp: imageio-webp 3.12.0
org_quiltmc_parsers_gson: gson 0.2.1
org_quiltmc_parsers_json: json 0.2.1
yosbr: YOSBR 0.1.2
zoomify: Zoomify 2.14.2+1.20.1
com_akuleshov7_ktoml-core-jvm: ktoml-core-jvm 0.5.2
Loaded Shaderpack: (off)
Launched Version: 1.20.1
Backend library: LWJGL version 3.3.1 SNAPSHOT
Backend API: NVIDIA GeForce GTX 1050 Ti/PCIe/SSE2 GL version 3.2.0 NVIDIA 566.36, NVIDIA Corporation
Window size: 2560x1081
GL Caps: Using framebuffer using OpenGL 3.2
GL debug messages:
Using VBOs: Yes
Is Modded: Definitely; Client brand changed to 'fabric'
Type: Client (map_client.txt)
Graphics mode: fancy
Resource Packs: vanilla, fabric, file/rcr1.20.1.zip
Current Language: en_us
CPU: 12x AMD Ryzen 5 3600X 6-Core Processor

Additional Context

Not selecting the Legacy Skins mod in the first place (or going and disabling it in the mod-list if installed afterwards) resolves the issue.

Acknowledgement

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