Please make allowances for my poor English.
When one strongly powered opaque block sends power simultaneously to the upper and lower adjacent redstone wire, the dropper or dispenser adjacent to the lower responds to the first pulse signal, but not to the second and subsequent pulse signals.
This happens only when the opaque blocks are at specific coordinates.
The coordinates seem to be distributed every 16 blocks on each of the xyz axes, and they appear to be axisymmetrically distributed around z=0 or z=-1.
I have confirmed that this bug has been occurring since 14w02a
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migrated
migrated
I was able to recreate this issue in Java 1.17/vanilla. Looks like it may be related to MC-193457 Dropper/Dispenser 'Triggered' block state not updating without player interaction.
anthony cicinelli
I was unable to reproduce in 21w39a
wobst.michael
Please check if this still can be reproduced in 1.17.1 or later.
migrated
I was able to reproduce this bug in 21w41a. This bug is coordinate dependent. Due to an update regarding coordinates, the regularity of the coordinates may be different from when I posted this.
reproduction video
tryashtar
If it's locational, does MC-11193 describe it?
migrated
I think this is a different problem than MC-11193.
It's hard to imagine that switching the order of power supply to the redstone dust could be the cause of the dropper malfunctioning.
migrated
it's a combination of that and MC-108; the top wire depowers last in the first setup, causing the dropper/dispenser not to get another update, but still be triggered as the block was still powered, while the wire below wasn't.