With the new player controller I assume, there's some walls that don't allow you to crawl under them, and just make you stuck on the other side of the wall, not letting you through.
I went prone, even took off my backpack, but I still wasn't able to crawl through the breaks.
Compound is NE of Sosnovka and the walls are facing east and north that I tried, it wouldn't work (marked on map below)
Can be bad/detrimental when in pesky situation, where you need to escape really quickly whether it's a gunfight infected, or wolves, etc. and then you realize you are stuck and can't get through
I think it's this specific wall type, which doesn't allow you to crawl under. (Shown in video)
Maybe in a object editor, just try crawling under this specific wall type?