I don't know if this is the right thread...but interesting/slightly confusing data point.

Traveling from ZRH-USA on LX operated flight with AC code in Y as a UA *G. Got a text/email from AC saying my cabin class has been upgraded and new seat is 11A. On the Swiss app, when I look at "travel details" on the main page it shows 11A as my seat. When I go to manage booking it shows my original seat. The flight is completely full so I am assuming this is an operational upgrade, but why would this happen and was I actually upgraded (flight is 22 hours away). Can't check in until I get to ZRH since connecting from EW.