• If you have a favorite in the Web Planner and edit its name there, the change isn't immediately synchronized with the app. You have to restart the app to trigger the synchronization; it seems this only happens upon startup.

Suggestion:
When opening the favorites list in the app, it should briefly synchronize with the Web Planner.

By converting a favorite into a POI this way, you can actually change the POI's name before saving it—something that isn't currently possible otherwise. s. Link Change POI name in app