FP4 android 13 bugs [solved]

Do not update to 13,
I have a mageor bugs that was solved 6 monthes ago on android 12 that came back :
the inability to phone under bad weather because the phone doesn t switch to 3G to get better signal.
Like the first versions of android on FP4 it stays on 4G and the person doesn t hear you, just with a little cloudy weather (lower reception signal)

Please Put Back The Patch To Make It Work In 3G When On GSM Call

Is there a possibility to downgrade to android 12 ?