Factory resetting the phone should fix it (this will delete all your data so make backups if you want to keep some things!). I’m not 100% certain though

Keep in mind that this bug will most likely reappear someday, maybe even sooner than later. So it might be worthwhile to look into custom roms if you’re a liitle tech savy and/or willing to learn a little bit. This also is your only realistically achievable option if factory resetting doesn’t work