This is almost one year old and still happen. KDE 5.20.5 (framework 5.78.0) Qt 5.15.2 kernel 5.15.0-0.bpo.3-amd64
sddm-greeter[2425]: Loading theme configuration from "/usr/share/sddm/themes/debian-theme/theme.conf
sddm-greeter[2425]: Loading file:///usr/share/sddm/themes/debian-theme/Main.qml...
sddm-greeter[2425]: file:///usr/lib/x86_64-linux-gnu/qt5/qml/SddmComponents/LayoutBox.qml:35:5: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
sddm-greeter[2425]: file:///usr/share/sddm/themes/debian-theme/Main.qml:41:5: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
