Stuff on left (part of wall, clock and the wood) appear invisible in-game and when going near Mule, FXs turns off and model disappears when being in one specific spot

Have you placed any decals around that area ?

Have you placed any decals around that area ?

There is few ones, I guess?

Sometimes if a decal is incorrectly placed it can cause invisibility of models in the map. Make a back up of the map and try deleting the decals in the affected area.

Sometimes if a decal is incorrectly placed it can cause invisibility of models in the map. Make a back up of the map and try deleting the decals in the affected area.

Theres no decals in there and I still get the invisible stuff. Theres also no brushes going there, that could cause this

Then i am not sure how to fix this, i would suggest checking if a model is causing it with a reflective surface or perhaps a wall gun is slightly out of line. You may have to have a trial and error of removing / adding things, to find the problem. I wouls start with textures as i rememeber having a bullet damage texture that was causing an entire invisible wall.