Apple has released iOS and iPadOS 13.4.1. This is a small bugfix release; it wasn’t ever even released as a public or developer beta.
The update fixes a glitch whereby users were having trouble connecting in FaceTime calls with devices running very old versions of iOS or macOS.
The release notes for iOS are as follows:
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Fixes an issue where devices running iOS 13.4 could not participate in FaceTime calls with devices running iOS 9.3.6 and earlier or OS X El Capitan 10.11.6 and earlier.
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Addresses a bug with the Settings app where choosing Bluetooth from the quick actions menu on the Home screen would fail.
