Isn't it supposed to only turn into ender pearl on liquid ender?

Right. Fixed by b5c6d1a but I haven't released a new version yet.

That was a game breaker bug. release new verse asap, also I would suggest that disable mashed potato CRAFTING recipe with the piston by default (still let it available on configs). You gotta be brave with the new features. (the point it to force players to make auto piston smasher by themselves)