Resolution: Cannot Reproduce
Affects Version/s: Minecraft 1.13.2
Fix Version/s: None
Sorry if this is too informal, this is my first time reporting a bug.
It appears that the one of the cat/tamed ocelot's textures is being replaced with a random texture alongside the UI for Furnaces, Droppers, and Dispensers. At first I noticed the UI was weird with Dispensers & Droppers, then noticed the same happened on other world with Furnaces as well. The second time around, the UI was a cat texture! After experimenting on that world, I noticed two of my cats were entirely white. I tried on other worlds and got the same result, eventually having a Horse with a Chest as the texture for both a cat and the UI. Finally I checked the horse and it had a zombie villager texture on another world.
It seems that only specific textures are swapped onto the blocks & mob, with textures staying consistent while playing but changing when reloading a world or loading a new world. I cannot seem to spawn the mob that the texture is swapped with, and I'm not sure if it's invisible or not.
I hope this info helps, this is a very strange bug.