Windows 11 Touch Keyboard pushes up content and create blank space

Question

I am developing an uwp app, in windows 11, when touch keyboard shows up, the contents is pushed up and there creates blank space between my page content and touch keyboard. When this happens, the page can be dragged and movable into blank space.This issue happens sometimes, not always. And this issue doesn't happen in windows 10. The code snippet is as follows:

private void InputPane_Showing(InputPane sender, InputPaneVisibilityEventArgs args)  
{  
  
      args.EnsuredFocusedElementInView = true;  
   
           var parent = Page.Parent as FrameworkElement;  
           Page.Height = parent.ActualHeight - inputPane.OccludedRect.Height;  
           Page.VerticalAlignment = VerticalAlignment.Top;  
  
        }