as already discussed with J-P there are some situations where some pressed-state-color remains. Have noticed this with ToolButton and ItemDelegate.
Never happened in apps like Gallery App, but always in my complex Apps.
Finally was able to provide a small example. Seems the Loader is the difference - if using ItemDelegates directly all works well, using a Loader it happens. See some attached screenshots.
Here's the demo code
import QtQuick 2.7
import QtQuick.Controls 2.1
import QtQuick.Layouts 1.3
import QtQuick.Controls.Material 2.1
text: "Drawer test"
width: parent.width / 3
text: "my Item"
For some of my apps this is a show-stopper