I experinced a bug on Experimental 0.62:

When fighting against zombies, sometimes you will be put into a bugged state,
Even when putting away the weapon, the character moves as slow as if the weapon is still out + raised, the only thing that can fix this bugged state is to raise a weapon (or fists) and lower it again.
when a zombies hits you when you are mid-swing (at least this happens mostly when i get hit by zombies mid swing, might be unrelated)
It happend to me with the following weapons:
Pickaxe
Handaxe
Fireaxe
Pitchfork

Best regards
-Zombo