I know this is an old bug but would have thought it would have been fixed by now considering the number of updates this year.
I ran a full scan last night. Scan GUI window showed circular motion but 0% throughout. If GUI window minimised a tray popup appears. This eventually correctly shows full scan % progress. If you then select "details" you get back to full window which still stuck at 0%. I let scan run to completion. Minimised pupup says "Done" but full window still showing 0%. Scan history shows scan compeleted.
I guess fewer people do full scans now, but would expect devs to have picked up this old reported issue by now. I live in hope.
Merry Christmas and Happy New Year.
Ed