RicTheCoder
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Wanted to add that the front of a Chiseled Bookshelf seems to do the same for items that can't go inside, so it might be related to the same thing.
Tested this on 1.21.4, it seems the problem still happens, I have tested wheat too, and it results in the same issue. Tested other things even by directly altering the villagers inventory, and it only seems to care about composting seeds, which makes me believe this might be intentional.
Tested this in 1.21.4 and I was not able to replicate it so it might be fixed? Forget about that last part, I made a small mistake on the test, replicated it based on the attached video and it still happens.
Still happening in 1.21.4, tested with wheat and it works the same, so I guess all items do, my guess is that the "selected item" is not really updated when the stack runs out at least not for the villagers close by.
This still happens in 1.21.4, however one cookie is used, and the other 7 get left inside the composter (as in dropped in). Not sure if that was the behavior on other versions, but it seems to be on 1.21.4
As of 1.21.4 this still happens sort of, so facing a dropper straight into the lava cauldron does make the items be destroyed eventually, but item entities are still made unlike what seems to be the behavior in Bedrock Edition.
Hoppers under the Cauldron can pick all items dropped, or most of them, which could be related to MC-203815 on the hopper side. But if no item entity was created hoppers wouldn't pick items up.
This still happens in 1.21.4, further more, this seems to be consistent if the time between drops is slow, all of them will get picked up, if faster it seems to be somewhere between 40% to 60% chance of being picked up. Stack size is irrelevant, dropping an entire stack picks it up, dropping two very fast tend to cause the second one to be destroyed.
Still confirmed in 1.21.4
Still happening in 1.21.4, however while Leather items get replaced by the cleaned version, shulker boxes seem to be giving you the result as an extra item instead of replacing.
Most likely because the way the code works, it gives you a shulker_box item instead of changing the component/nbt, while the leather items only replace the those values on the same item.
Can confirm this still is like this in 1.21.4
Tested this in 1.21.4, seems to still be present, might be that the book is returned by a `add` to the inventory instead of a `set_selected` which could be what causes the issue, the adding the item should only happen if the selected slot can't take it.
Small Observation:
Even though I agree with that chiseled bookshelf and how it works for the armor stand is similar and makes sense to be on par, the Lectern requires the Take Book button to be pressed on an interface that doesn't open the inventory so it might not need the same approach.