The llama chest have yet to be updated. These can be checked inside the vanilla resource pack template. assets\resource_packs\vanilla\textures\entity\llama
Observed Result The chest was still using the pre-texture update texture
Expected Result The texture would have been updated
I updated the ticket as donkey/mule already has updated chest texture, so the latter has been removed. Therefore, the texture changes made in 1.19.60.25 isn't the mentioned fix here, unrelated to this issue.
Donkey and mule does have updated textures in 1.19.60.25 Preview for saddle now has been fixed