Upon quitting a world, droppers will sometimes stop working. While they do recieve redstone power, they do not activate. Destroying and replacing problematic dropper(s) does fix the problem. Found on a flat world, not tested on a regular world.
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[Mojang] Mega_Spud (Jay)
migrated
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-17354.
It has been linked to this report. If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.
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