BSP missing collisions


After a huge upgrade from the 4.15 to 4.20 version all the BSP went broken since the Player can go inside the BSP geometry, also any object with Simulate Physics property enabled don’t collide with the BSP.

I know something was broken in the upgrade of the source code but probably you guys can point where can I start searching where is the problem? I don’t have idea from where start digging.

Thank you!