Apple's latest iOS 13.5 update includes tweaks to FaceID and FaceTime group chat that aim to improve user experience due to COVID-specific issues. The FaceID mask tweak makes it easier for users to unlock their iPhones and iPads when wearing a mask.
https://www.notebookcheck.net/Apple-s-COVID-19-iOS-update-iOS-13-5-and-iPadOS-13-5-deliver-easier-FaceID-with-masks-on-COVID-19-exposure-notifications-API-and-tweaks-to-FaceTime-group-calls.466132.0.html