Sorry for get back to you only now, I have latest companion and I did just tried again. To me is not working.
I set up a textbox and the isKeyboardOpen block. When I run the app and set the focus on the textbox the keyboard opens, then I use the “do it” on the block and it returns “true”, correct. Then I close the keyboard with the back button, use again the “do it” and again it returns “true”, incorrect.
Do you have a test app, maybe?