Was playing yesterday 12/18 on an official chernaurusplus server. I could obtain the server name if necessary but it was a US server and I'm in the US, ping was about 75. I had an infected agro in my so I ran back inside the sheet metal barn that has two sets of blue double doors on either side, with stairs on the inside that go up and around the perimeter of the building with access to a "room". As I was running through the doors I pressed F to close the doors behind me and it did. Then I heard the infected outside the door, grunting, similar to when they climb a wall, and he then ended up coming through the door. It seems as though he climbed over some edge of the floor and it gltiched thin through the closed door. He was on top of the floor as normal, like me. Not inside the floor.

It's on the edge of the water directly south of the village of Kamarovo. Next to the factory building. It was the east facing doors that he glitched through. GPS coords on izurvive is roughly 035.3 longitude, 131.6 latitude