Random "Could not take DOM snapshot" failures

[kennydp]

The problem

We have random missing snaphots when running our pipelines in our CI. Which snapshots are missing appear random. The pipeline failures also appear random. Even with the verbose logging there is no clear reason why this should happen.

Environment

• Node version: 20.18.1
• @percy/cli version: 1.30.6
• @percy/ember: "4.2.0",
• Type of shell command-line [interface]: percy exec --parallel --verbose -- ember exam --f 'percy'

Details

This is the error we get

not ok 31 Chrome 131.0 - [963 ms] - Exam Partition 3 - Percy | settings.edit: Edit settings page
    ---
        stack: >
                at console.eval (webpack://our-repo/./tests/helpers/index.ts?:73:42)
                at Object.invoke (webpack://our-repo/../../../../../node_modules/.pnpm/sinon@18.0.0/node_modules/sinon/pkg/sinon-esm.js?:71:516)
                at console.functionStub (webpack://our-repo/../../../../../node_modules/.pnpm/sinon@18.0.0/node_modules/sinon/pkg/sinon-esm.js?:385:257)
                at Function.invoke (webpack://our-repo/../../../../../node_modules/.pnpm/sinon@18.0.0/node_modules/sinon/pkg/sinon-esm.js?:316:199)
                at console.functionStub [as error] (webpack://our-repo/../../../../../node_modules/.pnpm/sinon@18.0.0/node_modules/sinon/pkg/sinon-esm.js?:330:92)
                at Function.log (http://localhost:7357/assets/test-support.js:1446:67)
                at Object.error (http://localhost:7357/assets/test-support.js:1420:25)
                at percySnapshot (webpack://our-repo/../rewritten-packages/@percy/ember.dd3fc99d/node_modules/@percy/ember/index.js?:95:9)
        message: >
            global failure: [percy] Could not take DOM snapshot "Edit settings page"
        negative: >
            false
        browser log: |
            {"type":"error","text":"[percy] Could not take DOM snapshot \"Edit settings page\""}
            {"type":"error","text":"[percy] TypeError: Failed to fetch"}
    ...

From what I can see this error comes from here:

percy-ember/addon-test-support/@percy/ember/index.js

Line 86 in 92226b3

} catch (error) {

But without an idea why the postSnapshot fails I can't really do much.

This is causing us to have to rerun our pipelines.

Let me know if you need more info