OK - I am having the same issue. I just upgraded to 2020 this weekend.
I tried to apply your fix. The terms SHOULD be credit card - but even with today's date, it is showing past due. So I changed the terms. starting with net 10 and working up. I have found that if I change the terms at least 4 times, the system will get rid of the Past Due. While this is a solution it is not really workable - I have 20 invoices showing past due, even if they are on Net 30 or 45 days.
Looking for a solution that doesn't take so much time perhaps? Because this is an ugly bug to deal with on an ongoing basis. Thanks!
