Focusing the previous element should be done when all the modals close.

1. button A is clicked, that opens modal B
2. button in modal B is clicked, that opens modal C.
3. modal B returns the focus to button A
4. modal C is open at this point.
   if you press enter, which will press button A. modal B will open on top of modal C.

Solution;
Common lastFocusedElement for all the modal open at one point.
after the last modal closes, focus the last focused element.