Just recently an issue began with my map. For some reason large sections of the map, if not the entire map, are being rendered despite the player not seeing them, and the console is being spammed with "too many visible entities". Also, the brush entities in one room disappear depending on where you look. I have no idea why this is happening, because it didn't start until the most recent room I built. I know for sure there are no leaks or other errors, except for something in the compile log about ambiguous leaf nodes.
Compile log:
https://pastebin.com/E2WWV27L