exact same issue with here, and more complex maps are extremely slow and eventually crash. The only workaround I’ve found for now is to disable SM6, but obviously this is not a solution
EDIT:
It does look like a driver issue, according to this mesa issue
RADV_DEBUG=hang works for me too and I was able to open the project with SM6 enabled
Can you try it out? I’ve just did RADV_DEBUG=hang ./Engine/Binaries/Linux/UnrealEditor and then open the project within that editor instance