At some point since my original comment the issue has gone away. I'm able to type using iOS 13.5 in the latest version of the game. I'm not sure if it was an Apple fix or a ZenDesk fix, sorry.
On my new iPhone 11 Pro, I can play the game and see comments from other players. But I cannot add my own comments. When I tap in the field to create a comment, no keyboard appears. Therefore I can...