I just spoke with BNA about this issue.  What they had me do was open the affected file in Notepad and change the first line from 2020.1 to 2019.1.  That fixed it.

The issue has to do with the BNA program treating the file as an "older version" file vs the newest version.  With the older version file, the software knows to look for areas that have changed and make adjustements.  When the file says 2020.1, the program assumes it has a current version file and that is why it bombs.