In Qt 5.8 QWebEngineView won't load Flash plugin when in debug mode

[RaquelCesar]

I built the WebEngine Demo Browser Example with Qt 5.8 in Windows 10. I then run the example in debug mode and open the page https://helpx.adobe.com/flash-player.html. Instead of the Flash animation I see the text: "Couldn't load plugin."

I can see the animation fine if I run the release build.