Quest v65 detected room keeps rendering with white material in walls, floors and objects

Hi! I have updated to v65, and added to my scene a MRUK object, and the EffectMesh object. However, when I run the application on the device, the detected room shows the walls as a solid white material instead of a transparent one. 

I have tried changing the material from EffectMesh, even disabling the EffectMesh object completely, as well as deleting the saved rooms in the device. Any idea on what could be happening?