Strange artifacts created

during some play I have encountered the artifacts. They are only shown when I use removing noise+Sharpening as the auto program suggested.
If I turn any of that off the artifacts disappear. Same if I add any other option.
Any clue what may cause these glithes?

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I got the exact same thing in one of my photos.

Similar. Note on the man’s left arm. Nothing at all like that in original.