Armor trims no longer render their second layer

Prior to 23w32a, armor trims rendered their second layer. Now only the first layer renders, and the rest of the texture is ignored.

In the attached screenshots, the helmet with wings is from 23w31a, and the one without is the same texture in 23w32a. I've also attached the trim texture for reference so you can see the area that is now being ignored.

This was something that was great for resource packs, so if it's intentional, I really urge you to reconsider this change.