Possibly caused by MC-268543.

The bug

All armor trim textures are compiled into an atlas when loading resources. For some reason, armor trim textures with specified animations do not become animated, unlike what is the case for every other type of texture which is added to an atlas.

How to reproduce

A resource pack that gives dirt and the coast trim the exact same texture with the exact same animation specifications is attached to this ticket.

1. Download and apply
2. Look at dirt
3. Look at something trimmed with Coast

Expected results

Both are animated.

Actual results

Only dirt is animated.