Surface Not Automatically Validated When Display is Closed and Reopened

[zhan2016]

I have pulled the code from your repository, and everything renders correctly in DirectX. The cube is also displayed properly. However, when I close the display for a few seconds and then reopen it, the application stops rendering anything. Simply resizing the application window restores normal rendering. Would you be able to kindly investigate and fix this issue?
Normal status:

worng status: