I have the ipados 13 beta installed on my 6th gen iPad. The bottom bar where you can normally select Home or Events etc is blank. See the attached screenshot.
I have seen multiple reports of the iOS 13 beta not playing nice. Staff are aware though!
but the buttons are playing an invisible magic trick - im using screenshots to approximate where to click until fixed - the only issues are the prompts /popups thats are nearly impossible to identify without switching to the android beta.