MySQL DB with SSL on Heroku - Error

I deployed the Metabase no Heroku to test it’s use, and the first time I connected to the MySQL DB it worked just right. For other reasons, I had to delete de access and add it again. This time the error below came. Same data, same DB, host, user and pass.

Any idea why? I know that the --require_secure_transport = ON means that SSL is needed, but Metabase Docum. tells that SSL is no problem.

UPDATE : this seems to be a bug. I started a issue in the github