Blocking main frame request from a Google Search crashes the process

In simplebrowser example add the following code:

class Interceptor : public QWebEngineUrlRequestInterceptor {

public:
  void interceptRequest(QWebEngineUrlRequestInfo &info) override {
      if (info.resourceType() == QWebEngineUrlRequestInfo::ResourceTypeMainFrame) {
          if (info.requestUrl().host().endsWith("qt.io")) {
              info.block(true);
          }
      }
  }
};

And install the interceptor on the WebPage.

When running the modified simplebrowser, it is not possible to visit qt.io as we get "ERR_BLOCKED_BY_CLIENT", as expected.

However, if we first visit google.com and search for qt.io, then click on any result that will open qt.io, it will crash the simplebrowser process.

Notes

When it crashes the firstPartyUrl is "https://www.google.com/search?q=qt.io&..."
while when navigating from any other page the firstPartyUrl is "https://www.qt.io/"

The underlying root cause might be the same as why https://codereview.qt-project.org/c/qt/qtwebengine/+/391497 was needed.