Vertical hoppers move items 2 by 2, twice the speed as normal, breaking redstone circuits that stops items by letting through the 1 of the 2 items.
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We're tracking this issue in MC-8361, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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This works the same way in 1.20.4.