I saw some horses spawned in with their textures partially invisible and mixed in with the turtle shell texture (I think)
Note: This issue only occurs sometimes, and goes away after relogging or restarting.
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Please provide a screenshot of this occurring while you have your F3 debug screen enabled - also make sure you are not using any resource packs.

I added the F3 screenshot, I also tried the same seed in creative, but the horses were normal.

Closing as dupe of MC-191242. Looks like the same issue, but different wrong texture.