Tropical fish fin UV mapping wrong

The bug

I haven't checked tropical_b, but would suggest a dev does check it. I've now also checked tropical_b and it also has mapping errors.

/summon minecraft:tropical_fish ~ ~1 ~ {NoAI:1b,PersistenceRequired:1b,Silent:1,Invulnerable:1,Variant:50660352}

On one side parts of the fin are overlayed and on the other they are not (see screenshots). This error effects all fins of the fish.
Whilst it looks fine in pixel art resource pack makers will struggle.