So, it looks like there may be a bug with zombies and doors.

I wasn't able to film it. A few minutes ago in Zelenogorsk military, I encountered zombies that couldn't cross open doors. This was on the western "double barrack" (www.dayztv.com/pic/dayz-0-58-new-barracks-in-vybor-military-base). (Zombies were even climbing on the building, that was a bit awkward).

In the same base, on the newly accessible L-shaped building, zombies were able to pass through closed doors, and were stuck in front of open doors. This might be related to the precedent bug.