I'm sure that most, if not all, of these issues have been reported, but I figured it wouldn't hurt to direct more attention to them.

The most apparent issue is zombies and their ability to walk through walls, doors, gates, etc. I would suggest fixing the clipping issue and possibly giving zombies the ability to break down doors and climb through windows.

There is a glitch in the jail cell on the bottom floor of what may be referred to as the administration building at the west part of the airstrip northeast of Krasnostav. Players are able to sink into the floor and hide themselves within the walls. Other players are unable to target those inside the glitch, but the ones in the glitch are able to attack.

I was sitting in the corner of sleeping quarters on the second floor of the aforementioned building when I tabbed over to my internet browser. When I returned to the game I had found that I was dead. Other players nearby informed me that my body was on the ground outside the building. When I arrived, I was unable to loot the corpse and it was no longer visible to anyone except myself. Not sure if the use of 3rd party programs by other players is the cause. It's possible that I had clipped through the wall and the floor simultaneously.

I was standing in the air traffic control tower at the airfield west of Grishino when I had taken a round from what I believe was a Mosin. I received the "Bleeding" status and so I moved down the stairs to apply rags. I also received the "Thirsty" status shortly afterward. I logged out of the server, logged into another server to move to a safer location, then logged back onto the original server. I had consumed a whole bottle of water and several cans of soda, but the "Thirsty" status remained. I ended up passing out and selecting the respawn option.

The large gates at places like military bases and airfields have a limited contact area, making it difficult to open and close them. They also disappear when the player is standing at certain angles.

Lastly, while I'm aware it isn't an unintended feature, I suggest removing the unlimited spring option when vehicles are added.