in 1.14 the the elytra item got a full reshade and given completly new colors, while the broken elytra uses the exact same colors as the programmer art one, and shares similiar shading
[media]
MC-270736
Broken elytra texture is inconsistent
Open
10
(Unassigned)
Community Consensus
Textures and models
1.20.4, 1.20.5 Pre-Release 1, 1.20.5, 1.20.6, 24w18a, ..., 24w36a, 24w38a, 1.21.2 Pre-Release 5, 1.21.4, 25w06a
Retrieved
Can confirm.