It does seem to be your operator and XIII (or maybe even your operator and your XIII) as just like in your bug report thread eson stated, others have 4G on 24/7 and don’t get that, me included.
And the rest is again subjective, 2/3 volume works for me even in noisy environments, I don’t use adaptive brightness, but use static 15-20% and only switch to 80-100 when needed, so never hit this bug, and again it took me a while to notice the effect even when knowing how to reproduce and what to look for, it is still insignificant. So yeah, espen, unless you’re hard of hearing and regularly browse photos in the dark with adaptive brightness, both bugs might scound scarier than they are (and again supposedly already fixed for 13)