Qt Designer crashes using QWebEngineView

Qt Designer (5.11.2) crashes on selecting the QWebEngineView-Widget.

I am creating a dialogform for including it in QGIS 3 as .ui file. In the form I want to display a website by using the QWebEngineView.

Sadly I am not able to drag the widget inside the dialog window, because Qt Designer crashes instantly on clicking the QWebEngineView button. The issue appears with Qt Designer provided with QGIS 3.3.0 as well as QGIS 3.2.3.

In the Windows Event Viewer I get the errorcode 0xC0000022. Is someone stuggling with the same issue and has any ideas for solving it?