Apple has released macOS Catalina 10.15.6 Beta 2 to developers along with the releases of iOS & iPadOS 13.6 beta 2 and tvOS 13.4.8 beta 2 one week post to the the release of macOS Catalina 10.15.6 beta 1 which was released along with Supplemental updates for macOS Catalina 10.15.5 and macOS High Sierra 10.13.6. This update comes almost after two weeks macOS Catalina 10.15.5 was released to the public with a new Battery Health Management Feature. Read more about macOS 10.15.5 here.
The build number for this beta update is 19G46c. The letter ‘c’ at the end of the build number indicates that macOS Catalina 10.15.6 will be released to the public after 2-3 more betas. Apple has not mentioned anything yet about macOS Catalina 10.15.6 Beta 2 in their Release Notes.
You can install macOS 10.15.6 Beta 2 through System Preferences on your Mac. Happy updating!