I definitely wouldn't do the Beta until you can confirm the app will work with it. I think there have been problems in the past when a new iOS comes out.I use the often-wonky TiVo iOS app on my iPad and was wondering if anyone has tried it with the iPadOS 15 Public Beta.
I'd like to give the beta a try, but if it won't work with the TiVo app, its' a deal killer...