I just updated to Sonoma, and when my MacBook restarted (which is docked to my Apple Thunderbolt Display), the colors looked different. The first thing I thought was that maybe True Tone had automatically been turned on (I leave it off). When I went to the display settings, the option for True Tone is no longer there. If I open up my MacBook's screen, True Tone appears as an option for that screen, but not for the Thunderbolt Display.
Now as far as to why the display looks different, that could just be because I selected to change to the new Sonoma wallpaper, and that may just be throwing me off.
But as for the lack of Thunderbolt Display having True Tone... is that new to Sonoma? I couldn't find anything online, and I leave the option off, so it could have been dropped in a previous update and I wouldn't have noticed it.
Now as far as to why the display looks different, that could just be because I selected to change to the new Sonoma wallpaper, and that may just be throwing me off.
But as for the lack of Thunderbolt Display having True Tone... is that new to Sonoma? I couldn't find anything online, and I leave the option off, so it could have been dropped in a previous update and I wouldn't have noticed it.