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I included the console output in case that might give some clue to a definitive solution.

I was reviewing the code and just in case, I forced: QColorDialog::DontUseNativeDialog

It didn't help at all, indeed :-).

It's true that there is that solution from qt6ct, but it's not intuitive. I'll indicate the steps to solve it in another post because it's a recurring error (many people have gtk-based desktops). In fact, I'll also make a "how to".