QFileDialog hang when choose files on wayland

I test the qtbase examples/widgets/dialogs/standarddialogs, I choose "File dialogs"->QFileDialog::getOpenFileNames to open the file window, then touch the file items, touch one time or twice, the window is blocked.

I check the code, it block in QWaylandWindow::waitForFrameSync. The while loop can't break.

I am confused when I touch to choose one item, there is a new window size of (493,17) to be created. I have no idea where this window is from? I think this is the root cause. It doesn't need to create a new window here.