Reproduction steps:
1. Open the attached project “ReproProject-IN-125527.zip”
2. Open “SampleScene” in “Assets\Scenes”
3. Open Package Manager from “Window → Package Management”
4. Install “Universal Render Pipeline”
5. Remove “Universal Render Pipeline”
6. Observe the crash

Reproducible with versions: 6000.2.0b2 (2bdac9ac0d74), 6000.3.0f1, 6000.4.0a5, 6000.5.0a2
Not reproducible with versions: 6000.2.0b1 (d17678da8412), 6000.0.64f1

Reproducible on: Windows 11, macOS 15.7.1 (M1 Max), Linux Ubuntu 22.04 (Nvidia)
Not reproducible on: No other environments tested

Notes:
-Does not repro on a fresh project, likely has something to do with user’s specific project
-MainCamera has to be present in the scene for the crash to occur

First few lines of stacktrace:
0x00007FFFEA630AE9 (Unity) keywords::PrintKeywordSpaceInfo
0x00007FFFEA62F615 (Unity) keywords::LocalKeywordState::BuildIncompatibleKeywordSpaceMessage
0x00007FFFEA630EF0 (Unity) keywords::LocalKeywordState::ReportIncompatibleKeywordSpace
0x00007FFFEA5F5DE5 (Unity) Material::ResetKeywords
0x00007FFFEA37E6E8 (Unity) MaterialScripting::SetEnabledKeywords
0x00007FFFE9A7FC32 (Unity) Material_CUSTOM_SetEnabledKeywords