When an item frame is placed underwater with a comparator on the other side of the block outside of water the comparator is not activated. The same set up works out of the water.
MC-136081
Item frames do not activate comparator when placed underwater
Resolved
Duplicate
0
Thomas Boatwright
(Unassigned)
Unconfirmed
Minecraft 1.13
Retrieved
Confirmed that this is still true in 1.14.4. Comparators measuring the output of waterlogged item frames do not produce redstone signals.