Don't know, if this is the right thread to report this nor if the changes I realized are caused by AOSP or GrapheneOS itself. Or if (some) of these are 'bugs' or maybe fixed bugs or implied improvements.
First the battery preferences panel: if Battery Optimization is toggled on (charging to and bypassing at 80%) the estimated time left is no longer shown but only "not charging" instead of it. When optimization is turned off, the time left is shown again.
Second the NFC-tile in the Quick Settings Menu: In Owner profile it works as expected, you can turn it on and off just by a short tap on it. In 2nd user profiles this doesn't work, a short tap does nothing. But if you tap a little longer on the tile, the common NFC preferences panel opens where you can toggle NFC on or off.
Maybe the NFC issue is related to the (temporarily) change/remove of the NFC auto-turn-off feature in any way. But I don't understand why the quick toggle tile works in Owner profile but not in 2nd user's. I'm pretty sure (not 100%) before the last update(s) it also worked in 2nd user profiles as expected.