I've noticed that when a grindstone is used to unenchant items, while it is being placed against a wall facing west, the XP orbs are getting stuck behind it. This happens regardless of the orientation of the grindstone (placing from the front or sides, or on the wall), as the XP always seems to be emitting in the negative X / West direction. For instance, if the grindstone is placed against a northern wall, the orbs will come out of the left side and not get stuck.
MC-164656
XP orbs getting stuck behind grindstone - always emitting to the same side
Resolved
Duplicate
0
So this was just resolved as duplicate. I don't really think it is an actual duplicate. I'm not sure if anyone actually read this beyond the title, and of course this does have something to do with the issue of XP getting stuck in hoppers and such. I was mainly referring to the grindstone though, as the issue seems to be caused by the fact, that Xp is always emitting towards negative X. I'm guessing that is not intended behavior, as it is not case for instance with the furnace (afaik).