I've moved him, but I do know the bones can be moved out of very tight spots by moving around a lot, sometimes they will "follow" you into a square, opposite the push. Hopefully it works better now.
It seems the item isn't checked for in the parallel event, because removing it would end said event. I'll have to figure out a solution yet, but you detected it correctly. Edit: I made an adjustment to how it tracks the ITEMS required for the result.