Today, July 27, Apple released the fourth beta versions of iOS 16 and iPadOS 16 for developers.
Most likely, the updates are focused on fixing bugs and errors found in the first three beta versions of iOS 16 and iPadOS 16. Installing the new test build requires a profile that can be downloaded from the Beta Profiles site. Remember to back up all your device data before updating.
The size of the update is 1.67 GB.