QWebEngineSettings::LocalContentCanAccessRemoteUrls and QWebEngineSettings::LocalContentCanAccessFileUrls doesn't work

To reproduce the problem please run the attached application without shadow build.
Expected result would be:
XMLHttpRequest displays a list of topics and Qt logo is visible.

Current result:
The debugger logs:

• Not allowed to load local resource: file://./qt.png
  qrc:/index.html:1 XMLHttpRequest cannot load
• http://www.w3schools.com/json/mytutorials.txt. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'qrc://' is therefore not allowed access.

Seems like:

    bool enableLocalFileStuff = true; 
    QWebEngineSettings::globalSettings()->setAttribute(QWebEngineSettings::LocalContentCanAccessFileUrls, enableLocalFileStuff);
    QWebEngineSettings::globalSettings()->setAttribute(QWebEngineSettings::LocalContentCanAccessRemoteUrls, enableLocalFileStuff);

doesn't work.