Hey there,
Since the 1.20.155844 update, I've noticed, and have heard from other players that they've been having issues with collisions with the ground and buildings.
I've noticed the bug happens a lot when the player goes prone or if the player is near a wall/floor, they can glitch into the ground. Mostly noticed on players with ping above 200. However this wasn't an issue pre hotfix 2, so I believe this minor update has changed something.