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 !
Daily Driver > Samsung Galaxy s²³ Ultra 512Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "