Using the farm in the video provided, the farm takes the nether wart blocks and turns them into bonemeal using a composter, but it seems that when the composter and the hopper pulls from the composter. The hopper is able to pull but it seems the bonemeal is just deleted.
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We're tracking this issue in MC-175090, so this ticket is being resolved and linked as a duplicate.
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Duplicate of MC-195426