Reproduction steps:
1. Open the attached “IN-89021.zip” project
2. Observe the crash or continue
3. Reimport “Pixel.asset”, located under Assets/General/
4. Observe the crash

Reproducible in: 2021.3.46f1, 2022.3.53f1, 6000.0.28f1, 6000.1.0a5

Reproducible on: MacOS 14.5 (M1), Windows 11

First few lines of stacktraces:

{noformat}0x00007FFF83EA33F9 (Unity) ContainerClear<std::map<DeprecatedFastPropertyNameSerialization,float,std::less<DeprecatedFastPropertyNameSerialization>,std::allocator<std::pair<DeprecatedFastPropertyNameSerialization const ,float> > > >
0x00007FFF83EBFE00 (Unity) UnityPropertySheet::Clear
0x00007FFF83E9A935 (Unity) Material::ResetWithShader
0x00007FFF8420063B (Unity) SerializedFile::ReadObject
0x00007FFF84200126 (Unity) SerializedFile::ReadObject{noformat}

{noformat}0x00007FFF1D7BC4F8 (Unity) BucketAllocator::Allocate
0x00007FFF1D7B2C08 (Unity) DualThreadAllocator<DynamicHeapAllocator>::Allocate
0x00007FFF1D7A42BD (Unity) MemoryManager::Allocate
0x00007FFF1D7AEC6E (Unity) malloc_internal
0x00007FFF1D202353 (Unity) core::vector<core::pair<int,int,0>,core::allocator<core::pair<int,int,0>,0> >::resize_buffer_nocheck{noformat}

Note: Sometimes, instead of crashing, the Asset Importing process is stuck and continues indefinitely