Iāve just done it with 1 incoming payment which qualified for early payment - worked as intended (got the pumpkin) and didnāt crash, although the ability to tap on it again wasnāt there - Android.
We have a joint account and my wife got the ākerchingā as I claimed the first incoming payment, so she raced to claim the second payment - she beat me to it, saw the pumpkin and said āit was well coolā 
No crash there either - sheās on Android too.
The tap-again/crash could be an iOS specific issue.
EDIT: More reports of iOS users experiencing a crash; Monzo crashes when accessing Upcoming Payment