Apple has released tvOS 13.4.8 beta 2 to developers one week post to the release of tvOS 13.4.8 Beta 1.
The build number for this beta version is 17M5545a and there are no new features spotted on this version as of yet. The letter ‘a’ at the end of the build number indicates that this may be the last beta for tvOS 13.4.8 and it may be released to the public after WWDC 2020.
If you have a developer profile set up on your Apple TV, go to Settings>System>Software Update and update your Apple TV. tvOS 13.4.8 beta 2 will support all devices supporting tvOS 13 which includes the Apple TV (4th Generation) and the Apple TV 4K (5th Generation).