Another observation: This problem is really Mac specific.
I installed Kstars at a Raspberry Pi with PRI OS "bullseye" and planets are visible. All is working well, despite the toolbar icons which are missing.
This problem can be fixed by installing the KDE "breeze" theme as follows:

sudo apt-get install breeze-icon-theme

Source: www.tanstaafl.co.uk/2019/08/missing-icons-in-kstars-and-ekos/

Any help for the Mac is welcome!!

All the best,
Alexander

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