Like you can see on the screenshot, when the tripwire is activated, the tripwire from the hooks, isn't anymore at the right sport. So you can see, that the wire texture from the hook is always too "long", so goes into the actual tripwire and when activated is always too low.
Also the texture from the tripwire from the hook is different to the normal tripwire texture (see screenshot).
And the tripwire texture is on the positive Z or negative X side always one pixel too large or something like this (see screenshot; relates to MC-73186).
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Dupe of MC-69834

Wrong duplicate link, MC-69834 is discribing the misplacement of the ring, this report is about the that the wire is not connected to the hook (and also about a texture bug with the wire)

Isn't the tripwire not connected because the hook is misplaced ?

What I meant is that the tripwire from the hooks isn't connected with the "normal" tripwire

@unknown do you still think it is a duplicate?

Yes.
Confirmed for 1.8.1 pre-3.