QtCreator crashes after opening Quick Designer when having Qt for MCUs kit selected

Opening a QML file first in edit mode and then selecting the "design" button makes the Qt Creator crash silently when having Qt for MCUs kit selected.

Way to reproduce:
1) Generate a template project for Qt for MCUs
2) Select Qt for MCUs 2.5 kit for some board, crashed fairly constantly with Qt for MCUs desktop kit too.
3) Open the template QML file in edit mode
4) Click "Design" Button which causes it to then try to open the designer but fails and Qt Creator crashes silently.