Unreal 5.4 Crash when i build lightmaps on a nanite landscape.

Development World Creation
1

Every time I do lightbuild on a nanite landscape, Unreal crashes.
I have tested in 5.3 and 5.4
Create an empty level, create a landscape (default values). Activate nanite on the landscape.
Build lights only and Unreal Crash.

LoginId:8313252344627557695c39b280895706
EpicAccountId:7c01eca0ff3841e7900d807c4132fd7b

Assertion failed: ExportSettings == *ExistingExportSettings [File:D:\build++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\Lightmass\Lightmass.cpp] [Line: 546] Attempting to add the same material twice with different export settings, this is not (currently) supported

Any ideas?

Thanks in advance.

2

This has been an issue forever and it still hasn’t been fixed.

Select landscape, turn off nanite, rebuild. After rebuilding turn back on nanite.