Had this happen to me 2 days ago. Upstairs of largest building at Zelenogorsk barracks. Standing between bed and lockers, another player approached me and the collision pushed me through the wall.

No way out as far as I could tell. Tried moving against every wall in the "invisible" room that I was trapped in; jumping, crawling, nothing worked.

Tried leaving and rejoining server to no success. Tried other servers. Other player noted he could see me sticking out of the wall when I went prone and tried to crawl but if I crawled too far I'd get pushed back.

Haven't yet been back to see if repeatable.