I’ve tried searching on this, the other requests were specifically when you cleared aircraft in a certain way or when the pilot switches to approach frequency.
The app crashes when someone requests vectors or flight following and then when you tap on their ‘other messages’ page to view their request below and then zoom out on the map page to view their destination airport for example. It’s been happening for the past 5 or 6 times when I did exactly the same thing.
Device: iPad Pro 12.9
Maybe this bug is specific to the iPad Pro 12.9" because I wasn’t able to reproduce the app crash on the iPhone.