4. Not a bug but something fun I found out... ge_basement is actually ge_library in disguise... using noclip I discovered the entire upper floor on library was nearly completed and I had a good time exploring with the flashlight
Yeah, ge_basement + ge_stack = ge_library.
Stack is far from finished (base geometry finished, 2 1/2 rooms detailed), I just happened to get Basement done several months before release and began work on Stack, and can't easily cut the top half off while leaving the bottom half. So instead I have walls cutting off the top from the bottom visleaf-wise, so unless you noclip it's like it isn't even there.