Apple、デベロッパー向けに macOS Catalina 10.15.2 beta 3 (19C46a)、iOS 13.3 beta 3 (17C5046a)、iPadOS 13.3 beta 3 (17C5046a)、watchOS 6.1.1 beta 3 (17S5446a)、tvOS 13.3 beta 3 (17K5445a) 配布開始
https://developer.apple.com/news/releases/