Can confirm
can confirm in 25w33a
As I mentioned, there was nothing in the changelog to state that the old format has changed, and if you want to make a multiversion pack you need to use this old format anyway. A breaking change like this being present without any mention in the changelog is unusual, which is why I don’t think it was intentional
can confirm on 25w17a
Can confirm on 25w16a
This seems to have been fixed in the latest snapshot 25w16a, it no longer happens for me on mac with an updated version of the test resourcepack (attatched)
Can confirm, this happens for me with the test pack on Apple M4 pro
This seems to be exclusive to models generated from a texture. Using a cuboid placed in the exact same position doesn't cause the z-fighting to occur, I've attached an updated resourcepack that reproduces this
Seems to be fixed in 25w04a
I don't believe this report to be invalid, this issue can be reproduced in a vanilla game and has been by a few people in the comments already. I also don’t believe this new behaviour is intentional, as there was no mention of it in the changelogs (other than the somewhat related technical changes to how animated textures are handled by the game). As far as I'm aware, non-square animated textures are a supported feature so I believe this should be looked at