Unintended Stippling -- but only in Material Preview

I am at my wits’ end.


Two days ago I redid my UV map. I changed nothing else… but now I am seeing this stippling effect in Material Preview mode. Even when my material is just a BSDF and an output, the effect is there. I’ve redone my masks. I’ve checked that everything is in place. No joy. The effect does not show up in Solid mode or Rendered mode–only in Material Preview. All I can find online are instructions on how to achieve this look, not get rid of it. Anybody here have a clue? This is driving me up the wall. Thanks.

What else is in your image textures, is there another UV layer in play with another image trying to blend into the main image?

Why do you have a Normal Going into the Transmission Weight?