Thank you for your report, moeb1us!
I have confirmed the issue and it is now scheduled for a fix.
Regards,
Andy

Yep, same thing happened to me.

On stable, the zombies cruise through 99% of the doors, too.

Makes the lock feature pretty useless since you can't use it against zombies.

I didnt experience that zombos are running through doors in running situations, sometimes they can when the door get closed too late.
But sometimes, when you shut a door and shoot or punch it somehow,
the zombos can imidiatly jump through that door like a flying superman and one-hit you down. Happend two times...
And in the big metal building with blue doors. Both doors were closed, but when you shoot, the zombos can run through the doors.

I think that when a zombie is behind a door, if you punch the door (opens a tiny bit) it can get in aswell.

I have seen this as well. I had two zombies outside a closed door at a jail house. They could not get in as the door was closed. I then locked the door with a lockpick and they immediately came through the closed door to attack me.

This might also be related:
On another occasion a zombie was outside a closed door. His arm was partially glitching through the door. I decided to see if I could shoot him through the door. As soon as the bullet hit the door the zombie came running through the closed door.

also, zombies can walk 'through' a partially opened door(by hitting it). Basically you can 'make' zombies walk through the enemy's door by shooting it once. I don't think that is intended.