For a comprehensive list of other examples of issues with 2D planes in models not being mirrored as expected, click here.
The bug
The planes composing tripwire hooks, when connected to tripwire, do not mirror on the back as one would expect, resulting in physical/illogical weirdness.
Fixed models (Mojang has full permission to use this fix):
[media][media]How to reproduce
Place a tripwire hook
Connect it to a tripwire circuit
View a specific tiny clump of pixels of the tripwire which is part of the hook block
View the exact same clump of pixels from the other side of the texture plane
Note that the exact texture pattern at that position is different, even though it should be the same
Linked issues
relates to
Attachments
Comments

Just putting down what it relates to doesn't provide any information. Please provide more information.
Can confirm in 21w06a.
Can confirm in 21w07a.
Can confirm in 1.16.5.
Can confirm in 21w11a.
Can confirm.