App freezes when using Split View

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What I did: Tried to use Agenda in split view with DayOne

What happened: Agenda froze - didn’t manage to open. But more importantly the whole iPad froze - couldn’t swip-up to get to the App Switcher, so couldn’t force quite Agenda or anything else.

What I expected: To be able to use Agenda in split view.

Things that might be helpful to know (Agenda version, OS and model, etc): I am using the latest Agenda for iOS, the latest iOS 12.1, and I am using the new iPad Pro 2018, 11 inch.

That doesn’t sound like a typical app bug. Should be very rare for an app to take down a whole iPad, certainly after the app crashes.

Is it perhaps just a coincidence? Does it always do this, or was it a one off? Does it happen with other apps?