I’m running /e/OS 1.11-s-20230510288098-stablegFP4 on my Fairphone 4.
Some time ago, I enabled the one shot auto brightness (see here). In the last couple of days while hiking in the sun, I noticed that the display was sometimes brighter and sometime darker - but the brightness value was always 100%. In some situations, it was literally hard to read details on the display at all, whereas in other situations (same level of sun/surrounding brightness) it was not an issue - it just changed out of a sudden.