If you look carefully, you can notice that boots and shoulders of armor model are slightly stretched horizontally. Normally they should be proportional to the body size. To see it easily, look at the glint. It's not square.
I just figured out that they're not stretched horizontally, but squished vertically, because the texture seems to be normal from top.
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Confirmed for 1.13.1.

Confirmed in 1.16.1 and 20w27a.
Can confirm in 20w48a.
Can confirm in 20w51a.
Can confirm in 21w03a.
Can confirm in 21w05b.
Can confirm in 21w06a.
Can confirm in 21w07a.

In 21w08a

Relates to MC-212747

In 21w11a
Can confirm in 21w16a.
Can confirm in 1.17.
Can confirm in 1.17.1.
Can confirm in 1.18.
Can confirm in 1.18.1.
Can confirm in 1.19 and 1.19.1 Pre-release 1.
Can confirm in 1.19.2.
Can confirm in 1.19.3.
Can confirm for MC 1.12.1.