in the highrise flats with locked doors on first floor you can enter through closed doors and go through walls. by doing this you can exploit the glitch positions and have the upper hand on other players because you can see all around through walls 360 but they cant see you.
also you can go into closed rooms and then drop below the buildings and view all around. if you see a person you can then jump through the walls then go shoot them.
go to first floor of high rise flats must have locked doors !
then run double jump at the door this will let you jump through the texture wall doors. then walk round rooms that are out of reach or if you walk to one of the rooms on the left you'll drop below the base of the high rise flats. then you can see and walk around underneath it.
to get out you can either run and jump out of the back of the texture /walls or at the front where the steps join the main buildings. i can do this every time on all of the flats with locked doors.
similar issue with other buildings in the mods and all that was needed was blocks putting on these walls or concrete barriers.
not sure if the new skeleton should stop this or if working yet so if you glitch you die or legs arms breaks.