The recovery mode isn't just a One Ui 3.0 glitch unfortunately. I'm on One Ui 2.5 and have to plug in to a computer or use the headphone option to be able to clear the phone's System Cache Files.
It seems the battery graph has been hit by One Ui 3.0 and hopefully should resolve by the 8.1.21.
This is discussed in Samsung galaxy-note20-note20-ultra-5g/battery-graph.
That's interesting about the Samsung Buds Live icon issue which I haven't seen before !
Current Phone ~
Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+
Samsung One Ui 3.1/ Android 11.