Textures for model legs of spiders are not mirrored properly .
In attachment added a ResourcePack for easy spot.
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Affects 1.13-pre5
Confirmed for 1.13.1-pre1
Confirmed for 1.13.1

Affects 20w30a

Affects 21w18a

affects 1.17
This ticket relates to MC-246249.

We've discussed internally and have decided to undo the changes we've made to the mirrored mob parts, as it is the current art direction to keep both limbs the same. We view that this works as intended.
Edit: Scratch this one, we think the mirrored legs on Spiders look fine! Keeping this change 🙂
Confirmed... I'm amazed that nobody noticed this before. (At least there is no other report about this here on the tracker apparently)