Flutter: “iproxy” cannot be opened because the developer cannot be verified

Flutter surprises. Every day is something new. Today, while running flutter build from the Android Studio on iPhone macOS (Catalina 10.15.7) started to show an error: “iproxy” cannot be opened because the developer cannot be verified. The quick fix is to run in the terminal:

sudo xattr -d com.apple.quarantine /FLUTTER_HOME/bin/cache/artifacts/usbmuxd/iproxy

Later, in System Preferences/Security & Privacy/General I noticed the message about that iproxy was blocked with the "Anyway allow" button. I pressed it in case, though it was fixed after the command above.