Droppers don't fire items into a hopper that has one item in each space, even if firing the same item.
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Cleaning up old tickets: This ticket has not been updated recently (1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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Seems to be the same issue as MCPE-22158, will mark as related.