1.21.10 "Tripwire hook dupe?"

was playing with ways to activate command blocks and put a tripwire hook on a trapdoor!

When activated, the tripwire powers the trapdoor that is attached to and breaks the tripwire hooks, 2 hooks drop, but only 1 physically breaks.
I do not know if it's a known dupe. But super cool!

Java Version 1.21.10

how it is built

result of activation