Comparator powered from a cake/cauldron through a block, doesn't update when cauldron is removed by a piston.
Summary should explain everything, if not look at the screenshots.
Code analysis by Marcono1234 can be found in this comment.
2013-05-28, 04:34 PM
2020-08-18, 01:53 PM
2017-10-09, 09:53 PM
32
12
cauldron, piston, redstone, redstone-comparator
Snapshot 13w21b - Minecraft 1.12.1
Snapshot 13w21b, Snapshot 13w22a, Minecraft 1.6.4, Minecraft 13w42b, Minecraft 13w43a, Minecraft 1.7.1, Minecraft 1.7.2, Minecraft 1.7.4, Minecraft 14w05b, Minecraft 1.7.10, Minecraft 14w30c, Minecraft 14w31a, Minecraft 14w33c, Minecraft 14w34a, Minecraft 14w34b, Minecraft 14w34c, Minecraft 14w34d, Minecraft 1.8-pre1, Minecraft 1.8.1, Minecraft 1.8.2-pre7, Minecraft 1.8.8, Minecraft 15w51b, Minecraft 1.9.2, Minecraft 1.9.3 Pre-Release 3, Minecraft 1.9.4, Minecraft 16w20a, Minecraft 16w44a, Minecraft 1.11.2, Minecraft 17w06a, Minecraft 17w13b, Minecraft 1.12 Pre-Release 6, Minecraft 1.12, Minecraft 1.12.1
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