• Open and build the attached project
• Run windeployqt (--quick --qmldir <project source dir>)
• Everything (including the controls plugin) seems to be deployed
• Run the application from explorer
• Application does not start

I get this error using a debug view:

QQmlApplicationEngine failed to load component
QML debugging is enabled. Only use this in a safe environment.
qrc:/main.qml:16 Type ScrollView unavailable
qrc:/QtQuick/Controls/ScrollView.qml:-1 No such file or directory

For some reason the Controls 1 .qml files are not available from the resources.

This is critical for Qt Creator, since it still uses Controls 1.