Comparator doesn't recognise whether there are items in a hopper or not (see screenshots).
I don't think I can explain it here, refer to screenshots, the bug is well explained and in detail there.
2013-03-30, 03:57 PM
2017-03-27, 09:44 PM
2013-03-30, 05:03 PM
0
1
chest, detector, rail, redstone-comparator
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