I recently uploaded a world and it’s a bit of a mess at the moment. my main issue is the assets disappearing randomly as I move around and I’m not sure how to fix it. I have a video posted below.
do the objects have lod groups?
you can check in the inspector

they make the objects disappear if the camera is too far away
occlusions are wrong
90% Occlusion Culling issue.
try adjusting these two depend on the world u do or untill u get the result u want.
- Smaller Occluders
- Smallest Hole