Nick_Wilson_MSFT so glad things are improving. Found another issue I think. So I was looking at a cell formula and decided to edit the formula in the debugger area. The debugger then updated the steps accordingly but those changes did NOT update the cell formula. OK that might be intentional and I could see useful (actually now see the save button to push the change back onto the sheet).
But then I navigated to a different cell and when I returned that same information was in the debugger (i.e. still does not match the cell). Ok, may be useful but could also cause confusion now.
THEN I edited the formula in the actual cell and the debugger still didn't change.
OK I finally found how to 'cancel' an edit made in the debugger. You have to right click in the header area or the debugger steps (not the formula area) and choose Refresh (or Ctrl-R).
BTW this was compounded by (and probably significantly led to most of the confusion) the fact the formula (and the debug formula) were pointing at spill-over ranges so the debugger has the warning banner that spill over ranges are not yet supported and therefore did NOT show the 'Unsaved Changes' notification banner.