Undo after CNTRL drag group of selected lyrics not working

Win XP
Revision 2920

To recreate

Load Adeste demo score
Shift Drag to select group of lyrics
Cntrl Drag to move selected group of lyrics
Cntrl Z to undo

Expected
All the moved lyrics should return to original positions

Actual
Only the single lyric at the mouse pointer when CNTRL drag commenced is returned to original position