Now you can unlock your iPhone with a mask on. Better late than never.

Washington Post - Technology News 

AirTag tweaks: iOS 15.4 packs a few changes to the way Apple's potentially creepy trackers work. Among other things, the update includes better recognition for nearby AirPods, so they won't prompt a concerning "unknown accessory detected" warning, and the ability to use the Find My feature on newer iPhones to lead you to AirTags placed around you. (Previously, you could only do this for AirTags you owned and set up.)