When I tried to enter the Cambridge police station (several times) every time a bunch of random items and brother hood of steel members are all spawned at the door and you either fall through the ground into an endless abyss or get stuck in the pile. I managed to get passed the pile once and talked to paladin Danse and he took me to the roof but once I got to the exit door for the roof it was missing the door and I could see through everything.
I reached out here hoping I could find a solution either from someone else or a patch from bethesda