The My Disney Experience mobile app has been updated. The update includes the following description from Disney:
The release fixes a bug preventing some Guests from trading their FastPass+ selections for new ones. We also resolved a delay so your plans are up-to-date when you open the app, and we improved how search results are sorted so it's easier to find what you're looking for.
Additionally, we've updated our park maps, improved messaging so it's easier to identify a weak internet connected, fixed crashes and enhanced performance.
Additionally, guests have recently reported that wait times for busses have also been added to the app for some locations.