I have the same problem.
I already deactivated ALL my Firewalls just to try -> Still no servers in sight.

Sometimes I get DE01 when I try it with Remote, but only from time to time.

I had the same bug in Novodmitrovsk in the City Hall on the stairs.

I moved the items in the first aid kit and then moved the kit, after that there were another first aid kit -> a copy of the first aid kit (also damaged inclusive the items in it).
Probably the servers don't "remove" the item when someone interact with it (Updating of items is buggy in general)

Also happens to me a few times. In my opinion it is the same problem like the rubberbanding -> Server think you are outside, Zombie attack outside and hit.
Client is inside but only he see him inside. The position is just buggy, when you drop something inside of a building it sometimes appears outside right infront of the door -> Buggy Position?