After todays update, my RPi2 failed to boot due to the kernel update of linux-rpi 5.15.56-4 -> 5.15.61-1 and my RPi4 failed to boot today due to the update of raspberrypi-bootloader 20220812-1 -> 20220823-1 (as discussed
here). Completely unrelated problems it seems. It is sad this distro exhibits such historically poor quality control for kernel and bootloader updates.