After I installed the latest beta v2021.11.19.0313 and reopened the app, I left the Settings page open for about 30 seconds of inactivity, and the app crashed and exited. This is on a Fire TV Stick 4K.
Crash Diagnostics submitted as af4e0bb6-b095-4869-b313-e11429d16088.
This has happened with most of the last eight or so beta versions, crashing fairly consistently on just the first post-install run, usually within seconds of opening the app. (Once the app is opened again, all is well until the next beta update is installed and run for the first time.) I've submitted crash diagnostics in the past each time I noticed this happen. Also, the crash occurs regardless of whether the just-updated app is opened from the home screen or if Open is pressed directly from the "installation complete" dialog.