Crash on Mesh::RecalculateNormals when calling Mesh.RecalculateNormals on a malformed mesh

Steps to reproduce:
1. Open the “user’s attached project”
2. Select the “TerrainGenerator” GameObject through the Hierarchy
3. Press the “Generate” button under the “Terrain Generator 3” component through the Inspector
4. Observe the crash

Reproducible with versions: 2022.3.43f1, 6000.0.16f1
Couldn’t test with versions: 2021.3.43f1 (due to compiler errors)

Reproducible on: macOS 14.5 (Intel), Windows 11 (by the reporter)
Not reproducible on: no other environment tested

Notes:

• Crash does not occur after commenting out line 119 in Generation3.cs

First few lines of StackTrace:

0x00007ff79cbd6422 (Unity) Mesh::RecalculateNormals
0x00007ff79a5f8444 (Unity) Mesh_CUSTOM_RecalculateNormalsImpl
0x00000238914a032c (Mono JIT Code) (wrapper managed-to-native) UnityEngine.Mesh:RecalculateNormalsImpl (UnityEngine.Mesh,UnityEngine.Rendering.MeshUpdateFlags)
0x00000238914a01f3 (Mono JIT Code) UnityEngine.Mesh:RecalculateNormals (UnityEngine.Rendering.MeshUpdateFlags)
0x00000238914a016b (Mono JIT Code) UnityEngine.Mesh:RecalculateNormals ()