You are probably right, and the driver is crashing because of the updated SDK. But now it sees your camera and tries to initialize it, and that's good. I think the fastest way to get the proper sdk would be to get it from indi repository again. And the driver also, just to be sure... You could try this:

sudo apt install --reinstall -y indi-qhy libqhy

And lets see what happens then when running kstars as root...

On the other hand, I tried to run some tests and see if there are system messages related to the driver being unable to open the camera when running unprivileged, but none at all. The only I can say is that trying to run as non-root fails:
qhy_ccd_test 
QHY Test CCD using SingleFrameMode, Version: 1.00
QHYCCD|QHYCCD.CPP|InitQHYCCDResource| START
QHYCCD|QHYCCD.CPP|InitQHYCCDResourceInside|InitQHYCCDResourceInside   START
QHYCCD|QHYCCD.CPP|InitQHYCCDResourceInside|    InitQHYCCDResourceInside   END
QHYCCD|QHYCCD.CPP|ScanQHYCCD|START
QHYCCD|QHYCCD.CPP|DeviceIsLIBUSBQHYCCD|vid = 1618 pid = 941
Open QHYCCD error
QHYCCD|QHYCCD.CPP|InitQHYCCDResource| END
SDK resources initialized.
No QHYCCD camera found, please check USB or power.

The same as root, succeeds. So I'll stick with the crude shell script solution, that is working so far...

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