QWebEnginePage::setZoomFactor does not work correctly when using setHtml

When setting the content of a QWebEnginePage using setHtml and setting the pages zoom factor via QWebEnginePage::setZoomFactor, the zoom factor does not get applied to the content on the first call.
The QWebEnginePage::zoomFactor() property reports the new value, but the content does not reflect that. When setting the content using setHtml again, the zoom factor is applied correctly.