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It worked fine until I upgraded Ubuntu from 18.10 to 19.04. Now the super key is not detected and I can't set it as a custom shortcut and neither use it with default shortcuts. I can't find anything about super key behavior in settings.
Under Settings > Region and Language > Input sources the keys of the preview keyboard work fine but the super key, fn key and menu key, which are not recognized (not highlighted when pressed). I also tried changing to English as input source, but didn't solve the problem.
Is there something I'm missing?
Info: GNOME Shell 3.32.0, Ubuntu 19.04, keyboard layout: Italian