view days ago I made the big mistake to upgrade my eclipse from 2020-06 to 2020-09.
After the upgrade the import of existing bndtools workspace didn’t work anymore.
When I switched back to 2020-06 everything worked again.
So be careful about what eclipse setup you use.
I also noticed that many users have different problems with the new eclipse version, so I suggest to keep your hands off and use 2020-06 instead.