Second screen overridden by route navigator

[jinqugan]

Describe the bug
when i call displayManager.showSecondaryDisplay() the second screen will display but it will switch the screen to the first route i navigate

To Reproduce Scenario 1
Steps to reproduce the behavior:

1. displayManager.showSecondaryDisplay() -> second screen display correct widget
2. Navigator.pushReplacement to route A -> second screen will display widget route A
3. Navigator.pushReplacement to route B -> now onward second screen will remain on route A
   • basically my second screen will auto switch to the first navigation route in my flutter app

To Reproduce Scenario 2

1. Navigator.pushReplacement to route A -> second screen will display widget route A
2. displayManager.showSecondaryDisplay() -> second screen display correct widget and then switch to route A
3. Navigator.pushReplacement to route B -> now onward second screen will remain on route A
   • no matter i call second screen function before or after navigator, the second screen still will look for the first navigator route as second screen

Expected behavior
I need the second screen only display the widget i want instead of the display first route navigator i called.