I’m having a general issue on iOS 13.3 using the Keyman app build 12.0.62–when I open or switch to an app with the Keyman system keyboard active, the Keyman keyboard is blank (just a grey rectangle) the first time I try to enter text. It doesn’t appear to be related to a particular language—it happens with English (US) as well as other keyboards. I can rectify this by hiding the keyboard by touching the screen somewhere other than a text entry field, then getting the keyboard to pop up again by touching a text entry field. This happens on both my iPad and iPhone.
If I have another keyboard active (e.g. one built into iOS) when I open an app, and then switch to the Keyman keyboard in the app, there is no problem.
I’ve searched for a solution/workaround for this but haven’t found anything on help.keyman.com, so thought it best to raise it here.