QML Button weird dashed line when using KeyNavigation

A minimal example is attached below.

From the https://doc-snapshots.qt.io/qt6-dev/qml-qtquick-keynavigation.html example,
it all works fine even if I replace the Rectangle with Button.

But If I add another button outside and start navigation with it, they will all have a dashed (or dotted) line around them.

Using AbstractButton will solve the issue.

Update:
Switch seems to have the same problem