Just a note that the issue is not only NOT solved, it is now even worse. 

When posting tax entries at the end of Jan, note on screenshot below that QB posted the entries as 01/23 and 01/30 Jan. I am now posting my 1st Qtr entries (starting with Jan) and cannot get QB to accept any entry date after 12 Jan 20. I posted Jan entries all as 12 Jan 20 and most all seemed to post as 12/01. Couldn't get an entry as 13/01. Note the second entry for 'Clarke'. It was entered as 12/01, but the posting reads 01/12 and appears after several Feb and March entries.  I had only two entries for March. You will notice that of the two, one was posted as 10/03 and the very next one was 03/10. You will also note that those two entries for March are now mixed in with Jan and Feb postings. I'm now using MacOS 10.15.4 - perhaps the new version further compounded the problem.