I have a couple flights coming up on connection carriers and I can see the seat maps on all those flights.
not sure if this is related to the change but I booked an international flight earlier tonight with the diamond desk and used GU's. I went in to select the seats and it wouldn't allow the seat assignments to stick either online or on the app and it required another call to the diamond desk to select them (for some reason they are backed up tonight, both calls I had to leave a call back number and wait 15 minutes).