Stage Manager when using monitors

Hi guys,

I am using the Stage Manager feature when sharing with a ViewSonic monitor.

Everything seems to go fine when I don't use the external monitor.

However, when I plug the monitor in, Stage Manager seems to only show on the monitor, not on the MacBook screen, and only tabs that have been dragged to the monitor appear on it. When in the desktop screen or in a small tab (with the size not full screen), the Stage Manager appears properly, but, for example, when I have a tab that displays the whole screen (like the Arc or Visual Studio Code tabs in the video), when I hover the mouse to the position of the Stage Manager, its behavior becomes strange (you can see in the video). It only shows a little part of the tabs, not the whole tab like in normal cases.

How could I resolve this?

Here is my video