How to reproduce:
1. Open the attached “IN-131931.zip” project
2. Open the “Gamiira01_BrothelZoneAuthoring” scene
3. Additively open the “Brothel_InteriorLevelAuthoring” scene
4. Open the Lighting window and change the Packing Mode to “xAtlas”
5. Generate lighting
6. Observe the crash

Reproducible in: 6000.3.0a1, 6000.3.6f1, 6000.4.0b5, 6000.5.0a5
Could not test with: 6000.0.66f1 (xAtlas is a new feature in 6.3)

Reproducible on: Windows 11
Not reproducible on: No other environments tested

First few lines of stacktrace:
0x00007FFEFBF65FB7 (Unity) PVRAtlassingData::Build
0x00007FFEFCE29862 (Unity) BakeJobPackAtlases::Execute
0x00007FFEFCD821AE (Unity) InputExtraction::BuildPVRAtlassing
0x00007FFEFCD3CFF4 (Unity) anonymous namespace'::BuildRequests
0x00007FFEFCD442ED (Unity) anonymous namespace'::Preprocess