See the screenshot below. Even if it works as intended, it looks so ugly. I'm using 32x32 pack, but that doesn't change the UV and the model of the elytra.
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Attached screenshot with default resource pack. Seems like it is the same stretched. Looking carefully it seems like it is exactly 2x thicker that it should be.

Is this also an issue in 1.11?

Oh, I forgot to reply, sorry. Yes, this happens in 1.11 too.

Confirmed in 1.16.1 and 20w30a.
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 1.18.2.
Does this occur without the resource pack?