(this is NOT the issue I reported in #9363) - Switch the "show windows from all workspaces or viewports" option off. - Cycle through several workspaces with open windows. - Switch the "show windows from..." option back on. At this point I am seeing several buttons in "toggled" state. They are corresponding to focused windows on other workspaces.
*** This bug has been marked as a duplicate of bug 9363 ***