IronPython 2.7.12 on .net framework 4.5 dependent on mono.posix 4.0.0?

[BigDLA]

Hello, I have c# MSTest project (in .net 4.8) that is referencing another c# project (also in .net 4.8) that is referencing IronPython 2.7.12. When running a test, MSTestAdapter is trying to load all dependencies. When it starts to load IronPython it throws an exeption it could not load Mono.Posix, Version=4.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756 (call stack see lower). I am bit confused, because nuget dependencies say IronPython 2.7.12 on .net 4.5 is only dependent on DynamicLanguageRuntime (>= 1.3.1). I verified in debug that it is indeed trying to load .net 4.5 version, but even if it targeted other framework, thare is dependence on Mono.Unix >= 7.1.0-final.1.21458.1. I dont understand where does this dependence comming from and how to solve it. And even if it were dependent on version 4.0.0, for Mono.Posix (or unix) there are only >=7.0.0 nuget versions available so where do I get version 4.0.0?

Call Stack

System.IO.FileLoadException HResult=0x80131040 Message=Cannot load file or assembly Mono.Posix, Version=4.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756 or one of its dependencies. The assembly manifest definition detected does not match the assembly reference. (Exception based on HRESULT: 0x80131040) Source=mscorlib StackTrace: at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks) at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks) in System.Reflection\RuntimeAssembly.cs:line 578

This exception was originally thrown at this call stack:
System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(System.Reflection.AssemblyName, System.Security.Policy.Evidence, System.Reflection.RuntimeAssembly, ref System.Threading.StackCrawlMark, System.IntPtr, bool, bool, bool) in RuntimeAssembly.cs