I don't have any third party keyboards installed. I added some layouts and that didn't fix it. Are you talking about "reset keyboard dictionary?"
I've now tried it with an external bluetooth keyboard and via Universal Control from my Mac, and it works fine. The third-party apps work normally too with the external keyboard. So its just the on-screen keyboard.
Yes, the "reset keyboard dictionary", exactly. Although you will obviously lose whatever it learned in the time you used it, but it's worth a shot. Weird bug.