The keyboard in the Revolut app keeps disappearing after updating to iOS 13.1. It vanishes after using another app. Only way to get it back is to swipe up on the Revolut app and restart it. Then it vanishes again after a few moments.
Told support when I was beta testing iOS 13.1 two weeks ago and their response was to downgrade to iOS 12! Hope this is fixed now that 13.1 is on general release.