The "Stage" attribute has been brought into the Status Report object, by way of creating a virtual attribute. This virtual attribute is displayed in the Status tab of the Modern UX, and also in the Grid view of that same tab. It is noticed that the virtual attribute shows only the current value against all the status report records. It does not show values as they were when those individual status reports got published.
This is working as designed. Virtual attributes only reflect the current values from the master project instance.