The bug

When the player break a tripwire with a shear, the tripwire do not break, you must need break the tripwire while in unattached state, it will be broken or dropped. and when the water flowing on the glitched tripwire will causes duplication glitch.

This issue relates to MC-129055.

How to reproduce

Steps 1

1. Build a structure like the image below (You must need placing auxiliary block(s) at the location that where the tripwire should be placed, then aim at the auxiliary block(s) to place the trapdoor at the auxiliary block(s), and then break the auxiliary block(s).
2. Manually opening the trapdoor
3. Break the tripwire with a shear
4. ←The tripwire do not be broken or dropped, creating a glitched tripwire.
5. Active the level to make the water flowing.

←The string will drops twice the amount.

Step 2

1. Place the tripwire near a chunk border
2. Repeat the step 1
3. Active the level to make the water flowing.

←The string will drops infinity.