How to reproduce:
1. Open the attached “IN-150160” project
2. Observe the crash
Reproducible with: 6000.6.0a2 (64de5ee36373), 6000.6.0b10, 6000.7.0a3
Not reproducible with: 6000.0.0f1, 6000.0.82f1, 6000.3.23f1, 6000.5.10f1, 6000.6.0a1, 6000.7.0a6
Fixed in: 6000.7.0a4
Reproducible on: Windows 11
Not reproducible on: No other environments tested
First few lines of the stack trace:
2026-08-24T11:11:06.532Z|0xa9fc|0x00007FFBE8D460D9 (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\mono\metadata\boehm-gc.c:1761] alloc_handle
2026-08-24T11:11:06.749Z|0xa9fc|0x00007FFBCB7D61C1 (Unity) ScriptingGCHandle::Acquire
2026-08-24T11:11:06.749Z|0xa9fc|0x00007FFBCB021639 (Unity) ManagedReferencesRegistry::TrackInstance
2026-08-24T11:11:06.749Z|0xa9fc|0x00007FFBC832636E (Unity) SerializeTraits<RegisteredReferencedObject<0> >::Transfer<YAMLRead>
2026-08-24T11:11:06.750Z|0xa9fc|0x00007FFBC8328D4E (Unity) YAMLRead::TransferSTLStyleArray<core::vector<RegisteredReferencedObject<0>,core::allocator<RegisteredReferencedObject<0>,0> > >
2026-08-24T11:11:06.750Z|0xa9fc|0x00007FFBC83265AB (Unity) SerializeTraits<ManagedReferencesTransferState>::Transfer<YAMLRead>