Screen brightness is becomming dimmer after round about 10 minutes

[Incanus]

Is it possibly the same issue as described here:

Random Screen dimming (while brightness slider stays at 100%) after A12 update

After updating to Android 12, the rightness of the display of my #fp4 randomly decreases, but eventually temporarily reverts to correct brightness, repetitively. The period of time during which its brightness is less than it should be is always greater than the period of time during which its brightness is correct. This has solely started to occur after the Android 12 update, and occurred approximately immediately subsequently, so I have cause to believe that it was caused solely by it.