I wanted to see what the cost was, so i put myself into creative and this is what it's costing me, 65 levels for an Iron fortune III pickaxe. Is this actually supposed to happen?
This is the same for any "Block" that can be placed after naming in an anvil.
Just found this out as well.
I too have this problem. the game hangs on a "Converting World" screen/
This very odd piston behavior has been the bane of my existence. using pistons in a compact fashion when they pull power THROUGH the air makes me pull my hair out. It is a bug that needs fixed.
I can confirm this is happening in my single player game as well.