sometimes its a texture missing, like you used a texture in the map then deleted it, or you are using a tex inside the engine or plugin folder
another possibility is you are packaging multi
only pkg astc
another reason could be you didn’t activate vulkan
quest doesn’t run ogl well, it uses vukan, so disable ogle and enable vulkan.
sometimes deleting intermediate helps as it forces all shaders to recompile.
in the log track down any missing tex
remove all unnecessary objects in the project and sometimes selecting all levels and migrating them (the levels, not their folders) can help as it will only migrate the things that are actually in the levels and anything extra is left behind.
I only use open xr plugin and disable steam and oculous plugs