As happened with the first beta version of iOS 16, in which some users were having TestFlight compatibility issues, it is now the turn of Mac users. Those who are running beta versions of macOS Ventura, are experiencing similar problems and especially lack of compatibility. Those blemishes are causing you to not be allowed to install or update beta apps.
When the first beta of iOS 16 was released, some users started experiencing compatibility issues with beta apps due to poor interaction with TestFlight. This application is a platform owned by Apple that allows developers to invite regular users to test beta versions of their applications. With macOS Ventura in development, many developers have released beta versions of their apps with new features ready for that new Mac experience.
The bug in TestFlight appears to be affecting almost all Mac users running the latest beta version of macOS Ventura, which it was released on August 8 for developers. At the moment the problem is still valid because Apple has not released a new version that can correct the problem, as it has happened in iOS 16 thanks to the updates that are being released. That is why we say that it is necessary to only install the betas when you know what you are doing and when it is necessary and especially on secondary devices. If we are not developers, it is better to wait.
The bug forces users to replace beta apps with normal versions, as each beta version has a time limit of 90 days before it expires. Since the TestFlight app no longer works, beta apps also stop working once they expire, and the user can't do anything about it. Developers will not be able to receive user feedback on new versions of their apps.
We will have to wait for Apple to solve the problem with a new update.