parametric mask has no effect if blend mode != normal
Encountered this in denoise profiled, 1st instance, wavelets (but NLM is the same), blend mode color, parametric mask exluding light parts of the image. Yellow mask preview shows the correct coverage, but the filter is nevertheless applied to the entire image. Not only on darkroom, also on export.
Oh, this seems to be a duplicate of
Didn't know it was so old...