iOS14 + iOS15beta2 only recognizes nopass, WEP, WPA, WPA2 or WPA/WPA2 within QR code You can check it using Hopper at: /Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/PrivateFrameworks/BarcodeSupport.framework

mailto:__@_?subject=Hello&body=11 (Accidentally missed the body)

This bug or "feature" is still present in iOS 14.7 beta 3.