As issue involves a 3rd party app, fix needs to be performed from the application side. It would be best if you let app developers know of this issue through their support channels.
As of 17 Dec 21 Xfinity Stream works excellent for me, I've been trying to find issues that would interfere with daily usability and I've run into not a single issue. Clearing cache, restarting device, uninstalling/reinstalling problematic apps, updating apps seems to help some with there issues...but for me no issues. I will continue to dig and relate information if any bugs arise.
