I was at the end of Pustoshka, closest end to vybor, outside the 2 story red brick house with scaffolding, and while fighting an infected with a kitchen knife I backed into the left of the door frame to defend myself and the infected collided with my character pushing my under the map. Constantly floating under the map the infected continued to hit me 9 more times before running to a friend close by, logging out and logging me back in sent me to the coast.
Since the 1.20 update, infected collision has been a problem when backing up to defend yourself. 9 times out of 10 the infected will collide with you and appear behind and hit you even when you blocked from the front. This same collision issue forced me under the map and got me killed. Defending against infected since 1.20 has become almost impossible without taking a few hits.