Several others have recently described this bug and Adobe is aware of the problem.
@Greg_S. Thanks for taht information. I did have contact with a friendly indian Adobe-specialist for PSE22. He did not kno about that fault and he did give the issue to another specialist. He should contact me, but I did not hear anything yet.
I also use PSE 2022. The effect you describe only happens on a blank solid color canvas. If I apply an effect to a photo or image, the results are what you would expect. Are you applying an effect to a blank canvas?
The attached screenshot shows the Neon effect applied to a black & white photo.