Thank you for your answers, guys!
But I'm specifically trying to get a stained-glass effect. With a dispersion value close to "1". Something like that in the picture "ref".
But even with values of 30-50, such artifacts appear in reflections. There is a feeling that the dispersion is multiplied. But only in some selective reflections.
Below is the variant "without" the problematic reflecting object. And one more option with a "minimum" dispersion parameter, and still there is a problem in reflection.