I disconnected while sat on this rock.
I spawned back in to find I was pushed into the rock on my screen.
To others I appeared normal, but to me, I was in the rock.
Changing to Normal Priority as the bug isn't game breaking.
Attached is a screenshot from my own game to clarify the position of the rock in the Heartlands.
It appears that this bug only occurs on this rock, though I will go about testing a few more to see if I can recreate it else where.