EDIT: just played 0.47.124631. Works now.

Can't hit a Zombie/Player with your fists or a melee weapon (baseball bat, ...) in the head.

Even when getting pushed away by a zombie (so distance is as short as possible) and aiming for the head you miss the punch/swing (like 90%). Also happens when attempting to punch a Zombie on the ground in the head. Occasionally you can knock it out.

I was running in circles for 5 minutes with another hostile player, both unable to hit the other one until i finally knocked him out somehow and ended that awkward "fight".