PageStack does not work the same way between run and debug

Reproduction steps:
1. Create a Qt Quick application(symbian component).
2. Write an application, See testPageStack.zip.
3. Set Desktop Qt 4.7.3 for GCC (Qt SDK) Debug at Target selector.
4. Run the application by press Ctrl+r. Click the "PreviousPage" or the
"Next" page. Everything is Ok, I can turn over the page.
5. Quit the application. Check "Link Qml debug Library" and check Debug
Port 3768. Start debugging by press F5.
6. When the application start, click the the "PreviousPage" button or
the "Nextpage" button. There are assign problem and type error in
application output. See output.png.
Can not turning over the page as running the application.