When a dispenser filled with bonemeal dispenses bonemeal to make a seed grow (wheat), it keeps on dispensing bonemeal even though the seed is fully grown (as long as it get a ticking signal). I think it shouldn't be able to dispens the bonemeal as long as there isn't anything that can take it right in fron of it.
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when i tested it on my world, it showed the dispensing animation, but didnt acctually release any bonemeal after it was fully grown. try fully growing a crop and then activating the dispenser and see if any bonemeal was actually released.
Of course does the dispenser dispense anything out of it's inventory as long it is ticked.