Accessibility is broken when using QQuickWidget

I'm trying to move my QML based application, which has working accessible features, to use a QMainWindow. When adding my QQuickWidget as the central widget of the QMainWindow, the app itself works great. When I fire up my screen reader, however, I just get the name of my application read twice. No elements whatsoever are accessible using any accessibility feature I've tried, not on OS X nor on Windows.

If I use QQuickView, accessibility features work (but I'm unable to use widget based components)

Apparently, other users have also found this bug: http://lists.qt-project.org/pipermail/interest/2018-February/029341.html