If the player attempts to put an applicable item (book, book & quil, written book, or enchanted book) into a chiseled bookshelf with a dispenser, they are unable to.
Steps to Reproduce:
Place a dispenser down
Put one of the applicable items listed above into it
Put a chiseled bookshelf in front of it
Power the dispenser
Observed Results:
The dispenser will drop the item into the world, rather than putting it into the chiseled bookshelf
Expected Results:
The dispenser would put the item it's holding into the chiseled bookshelf
Screenshots/Videos:
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Dispensers can’t interact with any block inventory. You’re confusing them with droppers, which work as expected.