Crash on CalculateNormals when MeshLodUtility.GenerateMeshLods() procedural mesh custom vertex attribute data set is using half4 for vertex positions

Reproduction steps:
1. Open the attached user's project ("MeshLOD-BugReport")
2. Open scene "Scenes -> SampleScene"
3. Enter Play mode

Expected result: The mesh is procedurally generated and the Editor enters Play mode
Actual result: The Editor crashes

Reproducible with: 6000.2.0a7, 6000.2.8f1, 6000.3.0b6, 6000.4.0a2
Couldn't test with: 2023.1.0a1, 6000.0.60f1, 6000.2.0a6 (MeshLodUtility is not available)

Reproducible on: Windows 10 (User), Windows 11
Not reproducible on: No other environment tested

Stacktrace:
0x00007FF9C145849B (Unity) CalculateNormals
0x00007FF9C30D70B8 (Unity) MeshLod::GenerateMeshWeldingHelperData
0x00007FF9C30D3EDA (Unity) MeshLod::BuildClusterLodMeshFromMesh
0x00007FF9C30D3CD7 (Unity) MeshLod::BuildAndApplyClusterData
0x00007FF9C0E5F96C (Unity) MeshLodUtility_CUSTOM_Internal_GenerateMeshLodsEditor
0x000002327B51CE58 (Mono JIT Code) (wrapper managed-to-native) UnityEditor.MeshLodUtility:Internal_GenerateMeshLodsEditor_Injected (intptr,UnityEditor.MeshLodUtility/LodGenerationFlags,int)