When using spaces on Mac, an application might end up being split over different spaces.
For instance, opening and closing a dialog from a main window and then moving the main window to a different space. When the dialog is opened again, then the user is taken to the space where the dialog was last closed, and the main window is no longer visible as that lives in the other space.
One would expect the dialog to be moved to the new space as well, and opened centered on its parent main window.