Hi @Ozykz ,
I have check the code and its NOT affecting my LGPU 5.3.0 preview code. My version uses STRATA (OLD NAME) not Substrate code and would explain why 5.2 samples build fine in 5.3.0.
Its something for the 5.3.1 binary to look for.
My LGPU 5.4 binary version does not have the same code, and obviously that code cannot run Epic GPULlightmass.
Looking at 5.4 code its fixed in there as well when I checked the updates.