When I build/edit assets in the scene everything runs smoothly. The problem is when I switch to game mode to play it where there are some holes and my character will fall through them. An example would be: I have a room attached to a hallway and in edit mode it is there. I can add tables, plants and whatnot, but in play mode that room is gone- with the exception of maybe one "floating" lamp (it's only floating cause the table it was on is not displayed in play mode). I have tried walking into said room hoping that it just wasn't visible, but I fall forever because the assets are gone. I can re-position the camera so in the hallway when i switch to play mode i can walk down to that same room and i can look into that room and everything is absent. Only a few places of the scene are like this; most of the game is fine otherwise. Any assistance with this is appreciated, thank you!