Apple、デベロッパー向けに macOS 12.3 beta 2 (21E5206e)、iOS 15.4 beta 2 (19E5219e)、iPadOS 15.4 beta 2 (19E5219e)、watchOS 8.5 beta 2 (19T5223e)、tvOS 15.4 beta 2 (19L5419e)を配布開始
https://developer.apple.com/news/releases/