The issue disappeared after I compiled from source over a fresh install of Ubuntu 22.04 headless server (no desktop) on an 8GB RPi4. Equipment was attached locally to the RPi4, and I ran kstars on the RPi4 with a remote X display (i.e., logged in to the RPi 4 via ssh -X from a remote X machine and ran kstars).

The github issue page (status now closed) says things should be cleaned up and fixed in the next release 2.0.8 due June 1, so this thread is now solved.

Thanks again to Aaron Morris for the help.

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