Hi,
There are similar problems reported here and there are reports of bugs reported and fixes in the pipe line for later versions
see report
Unreal Engine 5.6 Preview - General / Announcements - Epic Developer Community Forums
There are major changes of code for 5.5 , could not make a Luoshuang’s GPULightmass version for LGPU 5.5.
The code seems to have settled down, many parts of LGPU are now in 5.6 which had been removed in 5.5.
The only thing that The Ray Tracing Final Gather Shader file seems removed in 5.6, but not needed for LGPU
The code used in CPU/LGPU is still the same.