Qt quick design not shows correctly after reopen the qml file when the qml file have an additional state.

Steps:
1. Create a qt quick application project.
2. Open the main.qml file and edit it in designer mode.
3. Add an addition state and named "state1".Change some property in state1.
4. Save and close the file then reopen with designer mode again.
Expect Result:
Everything shows correctly in designer mode.
Actually result:
The preview window shows empty.(see attach picture).