u/EducationalAd2029

So clicking on change flight through check in was looking to see if I would take an earlier flight to Frankfurt after my upgrade cleared.
But as the picture shows, if I click on same day confirmation it gives me an option for my original fare class.
Further down I can also select the other flight options and it’s the same earlier flight but in the M care bucket.

Not going to risk this but anyone else see this?
I've never encountered this before.