I built a redstone machine that uses a version of hopper clock to count, and it must count exactly a certain number of times, and when it’s not counting, the hoppers must remain locked. However, after completing the machine and coming back to it the next day, there was an item in one of the hoppers that shouldn’t have been there. I suspect it has something to do with observers. Also, relogging caused the hopper to unlock again, so it is consistent.
The machine is a sculk-based serial data encoder/decoder combo, fyi.
1st image - combo of lights that’s supposed to be sent
2nd image - result
3 & 4 - show the hoppers with the wrong amount of items (supposed to be five in the one with four items and zero in the one with one item)
This issue is being tracked at MCPE-29548.