Qt Widgets screen blacks out on resize of browser window

Steps to reproduce:

1. Build a widget example, for eg. "calendar widget" example
2. Select Webassembly 6.2.10 as project kit
3. Run the application
4. Try to resize the browser window

Actual Result:

Resizing the browser window blacks out the application until the cursor moves back into the browser window.

Expected Result:

Resizing the browser should just resize the application, nothing else.

Note:

1. The browser which was used was "Firefox"
2. The same behaviour was seen on anchor layout example and basic drawing example.