Dropper towers (designed to work as an item elevator) seem to be very tempermental. The same design works flawlessly in 9 out 10 instances, but it seems that depending on where the tower is located it may not work, even if no other blocks are touching it.
The item elevator in the image is bugged, but all the other ones behind work just fine. It seems to me like the half-slabs are being recognized as blocks; even though the redstone on top of them looks like it recieves the pulse from the comparator, the signal does not travel to the top and the items get stuck in the 4th dispenser.
I'm not sure if this has to do with the droppers, or the half-slab ladders leading to it. I've tried unsuccesfully to recreate the bug in creative; whether or not the elevator works seems to be dependent on where in my world it is located.
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I came to the conclusion that the droppers were bugged after all. Running the redstone along the other side of the bottom seems to make the signal climb all the way to the top, but I can't explain why. The world this is in is HUGE and I wouldn't want to upload it here, but it's a very standard-design dropper tower that I use regularly in other places in the world (as well as in the room itself, as part of an automated storage system).
TLDR; It's no longer preventing my machines from working but it is an inexplicable and inconvenient bug.
Is this still an issue in the current Minecraft Snapshot 15w49b or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
Ticket resolved as incomplete, because no answer in a reasonable amount of time (1+ year), if it still happens, please update the ticket.
ilmango's various videos on this topic demonstrate that the behavior of droppers is heavily affected by direction and location, such as this one:
https://www.youtube.com/watch?v=SHdH9lMpBX0
In general, making chains of droppers work reliably is very challenging due to inconsistencies in the way that signals propagate through redstone components. It's one thing if these things behave in a way that is unintuitive, as long as it's consistent. There are lots of videos of people like ilmango and Panda4994 talking about redstone inconsistencies, directional dependencies, etc.
World DL or Video please?
Also this could be due to the fact that:
Droppers can be budded
Redstone signals only reach a certain distance
Tower might be designed incorrectly