Can you send in a screenshot of the Filters you are using in the Right Panel?
Please include the dropdown options that show the sliders and AI model options being selected.
This can give us a better understanding of what might be the issue.
I am getting white specks in very dark areas after using the denoise/sharpen function as well.
I am processing bird photography. When the bird has black markings or really dark markings I get a few or more white specks/pixels in my output file. I am using photo AI as a plugin in Lightroom Classic.
After export I have to reopen the tiff output file in photoshop & remove the white specks/pixels.