As of June 23rd 2020, Avid announced that Pro Tools 2020.5 is supported with macOS 10.15.5. However, be aware that macOS 10.15.4 is NOT supported. When recording or playing back audio, the OS may lock up and require a hard reboot. Avid has found that Thunderbolt 2 spinning disk drives are more susceptible to this issue.  Until further notice, Avid recommends that you continue to run Pro Tools on macOS 10.15.3 or macOS 10.15.5 and refrain from installing macOS 10.15.4.