Dispensers and droppers are powered by redstone up to two blocks above them or directly diagonal one block above them. They remain constantly powered, thought they do not register as powered, and will no longer dispense blocks until the power is removed.
Photos can't do this bug justice, so here is a link to a short video describing the problem in it's entirety: https://youtu.be/JDDPc-alMhU
This bug was mentioned by MC-108 but that report only describes piston behavior with no reference to droppers/dispensers beyond the title, so this is for further reference on what may be the same issue with pistons.
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Arisa Bot
migrated
MC-108 was concerning piston QC power, which I understand is not a bug. This ticket is concerning unconnected redstone powering and subsequently locking dispensers and droppers in what can only be an unintended fashion. This is a legitimate bug and should not be marked as duplicate to a bug reported 8 years ago, despite their similarities.
Thank you for your report!
We're tracking this issue as MC-108, 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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