Minecraft 1.4.2, Minecraft 1.4.3, Minecraft 1.4.7, Snapshot 13w01b, Snapshot 13w02b, Snapshot 13w03a, Snapshot 13w04a, Snapshot 13w05a, Snapshot 13w06a, Snapshot 13w07a, Snapshot 13w10b, Minecraft 1.5, Minecraft 1.6.4, Minecraft 13w38c, Minecraft 1.7.4, Minecraft 14w03b, Minecraft 14w08a, Minecraft 1.10.2, Minecraft 16w43a, Minecraft 1.11 Pre-Release 1, Minecraft 1.11, Minecraft 16w50a, Minecraft 1.11.1, Minecraft 1.11.2, Minecraft 17w06a, Minecraft 17w13b, Minecraft 17w15a, Minecraft 17w16b, Minecraft 17w17b, Minecraft 17w18b, Minecraft 1.12 Pre-Release 2, Minecraft 1.12.1, Minecraft 1.12.2, Minecraft 17w43a, Minecraft 17w43b, Minecraft 17w50a
When you (un)power a torch with a 2-tick pulse (here and from now on I mean redstone ticks), it turns off/on for 2 ticks as expected.
But if in the same tick you update the torch and then (un)power it, it produces only a 1-tick pulse (so they won't unpower 2-tick repeaters or (un)power other redstone torches).
This can be reproduced in multiple ways (all pistons in the screenshots are sticky):
- Updating with other torches (see torches-#.png: only 1 repeater will be unpowered)
- Updating with redstone (see redstone-#.png and old-fixed.png: repeater/torch to the right won't unpower)
- Updating with a repeater (see torch-repeater.png: repeater to the right won't unpower)
- All setups (beside old-fixed.png) show the issue with powering the torch; for unpowering you can just invert the input signal and use torches to see the bug (see inverted.png)