Qt 6-based Qt Quick Designer shows an error message about missing Qt Quick Controls 1

When opening the Qt Quick Designer in the Qt 6-based snapshot (see: https://www.qt.io/blog/qt-6-based-qt-creator-snapshots ), an error message about likely missing Qt Quick Controls 1 is shown.

While I can imagine that some things in the Qt Quick Designer need to be adapted to run on Qt 6, I doubt that Qt Quick Controls 1 plays a role, anymore.

So, this Jira issue is just about the error message per se.