The bare sheep texture map has sections that were not removed in 23w31a when this was first fixed.
Unused Pixels:
[media]
Fix:
[media]Linked issues
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Comments 6

In 1.18.2 and 22w15a.
Can confirm in 1.19.
You missed a couple of them at the left of the top of the legs, and right of the bottom.
I've attached sheep unused pixels.png
to highlight these as well.

Can confirm in 1.19.3 and 23w03a
Still a couple of things missing.
[media]
Good job! I think this is not really a bug. A simple flaw that does not affect the gameplay.