Looks like the player doesn't touch the elytra.
Potential solution:
Apply stick's hold model or
flip the sprite in the hand
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Comments 12
Relates to MC-92274.
2 more comments
This is most likely an intended "feature" than a bug. It looks fine in First-Person... Your solution might change the perspective of the way you see the elytra in First-Person View .
display position and rotation are separated for first person right hand, first person left hand, third person right hand, third person left hand, head slot, dropped item, and item frame; moving and rotating it on 1 of them does not affect the others.
Can confirm. Also affects 1.16.5.