Enlarge / The 2020 MacBook Air; this macOS update fixes a problem that could cause it to hang in Setup Assistant when the user disconnected and reconnected a 4K or 5K external display. (credit: Samuel Axon)

Earlier this week, Apple released updates for iPadOS and iOS to fix a bug that prevented devices running the latest software from joining FaceTime calls with some older devices. Now, Apple has done the same with macOS and watchOS, but the macOS update includes a few additional fixes, too.
Apple has labeled the macOS update as a "supplemental update" to Catalina 10.15.4, indicating that it is focused on timely bug fixes. Apple says the update fixes an issue that caused Office 365 users to be repeatedly prompted to enter their passwords; addresses a problem that could cause 2020 MacBook Airs to stop working under certain circumstances when disconnecting some external displays; and resolves a problem that prevented USB-C ports from working.
We discussed the FaceTime bug when the iOS update hit on Tuesday; a previous software update caused a problem that prevented users of devices running macOS 10.15.4 or iOS/iPadOS 13.4 from communicating via FaceTime with users running iOS 9.3.6 or OS X 10.11.6 or earlier. Obviously, a near-global shelter-in-place order meant that bug had some very unfortunate timing, so Apple was fairly quick to remedy it.

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