The elytra texture does not get displayed right in any way.
If I only wear an elytra parts of my skin get displayed on it.
If I wear an elytra an any other armor part parts of the armor part get displayed.
If I wear an elytra and I hold anything in my hand a grid of textures gets displayed on the elytra.
To recreate simply put on an elytra and do one of the upper things.
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Duplicate of MC-107148