When Jasper redesigned the Zombie Pigman texture, he forgot about the fact that the game flips the texture when applying it to the mob. Can be easily fixed by flipping the segment vertically in the texture file.
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Confirmed in literally all versions since 1.0.0's Beta 1.9 Prerelease (so also 1.1.4.4 and 19w46a).
I'll attach some screenshots showing the issue in a second.
EDIT: attached a screenshot with and without the body texture removed but head untouched, for visibility purposes.
Please do not mark unreleased versions as affected.
You don't have access to them yet.