I found that if a comparator is outputting a signal from the dispenser into a block that has redstone dust on top of it and then a block to the side of the redstone dust facing the dispenser direction, then any block placement update to the dispenser will trigger it to shoot out an item that it has stored.
View the following video for more in-depth visualization:
This seems to affect 1.15.2 and the newest snapshots, I haven't tested it on any earlier stages of the game.
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violine1101
migrated
The video was set to private (my bad) I updated the link to the video, it should work now.
NeunEinser
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 for the time being. Please check MC-108 for more details about this behaviour.
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I cannot access the video you linked.
Could you provide a screenshot or upload the video somewhere else?