Good reminder. We too had no problems upgrading our UT ticket to a Seasonal Pass for DGD. Cost $0 to upgrade
Funniest thing of all, I had plum forgotten that she had an AP! (Getting old sucks!) I didn't remember until I went in to look at the app and saw it. I'd already bought the ticket. But, her AP expired on 6/3. Our last day in the park was 6/4. So, we could have skipped the parks on our last day, which would have kinked up our plans a bit or just did what we did, and used the ticket I bought that I thought she needed for our trip and renewed her AP again. Next year, we'll do Universal first, so we can get another trip in on her AP