Using an Amazon Fire TV
Tripwire fails to detect a bobber floating (not with a fish on the line) on top of the water directly below it. It will detect the casting correctly. Removing blocks under the hooks results in the same.
Casting the bobber onto a solid block under a tripwire detects and keeps the hooks activated; without any regard to how the bobber ends up there.
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is duplicated by 4
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Some additional information from testing. Water source has different heights depending on surrounding water blocks.
Single water block, surround on 4 sides - water is 3 pixels from the top. Bobber sits well within the water source block, not activating tripwire in block above
Single water source in complete 3x3 box - water is 2 pixels from top. Again bobber fully sits within source block
Single source block with water blocks on corners will raise the bottom source block to the full block pixel height. Bobber will be floating between blocks. Assumption is tripwire would be activated but unable to test due to water removing string.
Single source block with solid blocks in corners (vs water source) revert to 2 pixel height (as seen in last comparing image.
Not sure if this is expected behavior or not.
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This was with testing the Win10 version. Assumption is other PE version similar effected.
This might be related to the way the fishing float/bobber entity is designed in MCPE. Compare the Java version, where the float actually sits within the same space as the tripwire line:
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