https://wccftech.com/new-macos-10-15-6-supplemental-update-released-with-wi-fi-and-icloud-drive-fixes/

Apple has released a brand new macOS 10.15.6 Supplemental Update which addresses issues related to Wi-Fi and iCloud Drive.

Just four weeks ago, Apple released an important Supplemental Update for macOS Catalina users, and today, the company is doing it again to address an issue related to Wi-Fi and iCloud Drive. In short, if your Wi-Fi and iCloud Drive aren't playing nicely with you then you might want to upgrade without giving it a second thought.