yes that makes sense. I knew that Pi OS dropped the proprietry camera drivers when it went from buster to bullseye.
This is why you have to install the old buster version for allsky software to work, and also why I was able to compile the indi_rpicam driver
on my allsky buster pi.

But you can install kstars-bleeding on pi 4 (all versions).
You need to download and burn an ubuntu desktop arm images (32 or 64 bit) and then follow the instructions
ubuntu.com/download/raspberry-pi
indilib.org/get-indi/download-ubuntu.html

This is how I use kstars on my pi4's .

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