Apple has just officially released iOS and iPadOS 13.4.1. You can update an iPhone or iPad by going to Settings > General > Software Update.
FaceTime Fix and More
The update offers a number of bug fixes. The first affected devices running iOS and iPadOS 13.4 where they couldn’t participate in FaceTimecallas with devices running iOS 9.3.6 and earlier or OS X El Capitan 10.11.6 and earlier.
Apple also fixed a bug with the Settings app where choosing a Bluetooth from the quick action menu on the Home screen would fail.
On iPadOS 13.4.1, Apple also fixed an issue affecting the newest iPad Pro models released last month. Pressing the flashlight icon in Control Center didn’t turn the flashlight on.