https://wccftech.com/apple-releases-ios-13-5-5-and-macos-10-15-6-beta-to-developers/

Continuing with its whirlwind releases of operating system updates today, Apple has released new beta versions for iOS 13.5.5 and macOS 10.15.6 to developers, with under-the-hood bug fixes and improvements.

Apple has not shared any release notes for these updates, apart from the usual 'bug fixes and improvements' line. However, for seemingly minor updates, the developer beta updates require a full download of multiple gigabytes.