So recently me and a friend started to build a Wither Farm. Thing is it's a bit broken. With Aikar's new updates to the mobs not being able to take damage unless they have some form of hitting you. My question is has anyone found any way around this, I mean currently I'm working on something but have had little to no luck.
He means the wither skeletons If you can get them down to be one hit kills then this problem won't occur. Currently when I try to use a lucky bow I get the error you're having but when I have a sword I don't, just because they are one hit.
My problem is my Wither Farm tends to spawn Blazes but I think I figured out a system to where it won't occur as commonly.
I can show you a good crusher setup that will kill everything besides the wither skeletons if that's what you're looking for?