I think I have found a bug.

Thing 61 (1-legged man hanging from roof, non-blocking) seems to have his height offset all wrong, and looks like he starts hanging "in" the roof.

Compare to Thing 51 (the same sprite, blocking) which appears to have the correct height, as do the other hanging person sprites.

This behaviour is identical in PrBoom-Plus, however ZDoom displays both sprites correctly.