I found a wandering trader with both of its llamas' heads grey-scaled, and the rest of their bodies have lost their skin texture, with it being unusually pixelated. The issue seemed to reach horses, because the horses I found in that same world were all completely pitch-black, whether they naturally spawned or I used a spawn egg.

I thought it was just that one world glitching, until I loaded my survival world and I saw my horse and llama having the exact same issue. Their heads grey-scaled and everything. (My horse's body was creme-colored, but it's actually brown?)

I'm not sure if it's happening to anybody else, and it could be an issue happening to other mobs too, because I haven't checked. There was a very recent Bedrock update that supposedly fixed the problem with Wandering Traders and their llamas spawning underground, lava, or water, so that maybe that bug fix caused another bug.