After last update (android 11, one UI 3.0) all notifications and sounds work except for incoming calls ringtones. Tried everything. I can hear the sound when browsing library. Both speakers are fine. Screen lights up normally when receiving call and no sound..
Just as one of the first steps @Tosuia please go into Settings, Apps, Phone and Storage and clear cache.
Current Phone ~
Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+
Samsung One Ui 3.1/ Android 11.