I encountered this problem when building a tree farm on a paper server, so I tested it in my local vanilla creative world and the problem still exists.
I have searched and looked at MC-158219 and MC-165417 in which similar problems have occurred. I have tried the fix provided, but there is no tiletick entry in the chunk viewing from the NBT explorer.
To reproduce
It is unknown what causes this issue. A test world in which this issue occurs is in the attachment.
For details please take a look at the screenshot and the world download.
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NeunEinser
Thank you for your report!
We're already tracking this issue at MC-161248, so I will resolve and link this ticket as a duplicate.
The affected dropper stays on triggered:true, which is why it does not fire. Analysis on why this likely happens in this comment
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migrated
Thanks for pointing out this is an existing issue! I am not particularly familiar with how block update works in the game, the workaround provided in MC-161248 doesn't work for my case. Can you provide a solution for my case?
NeunEinser
You need different delays for the redstone line that powers the top dispensers and the one that powers the bottom. The top should update before the bottom does. Within the same tick, comparators update after repeaters, so you could use that to minimalize the delay.