I had the same problem today when moving from MySql.Data 7.0.7 to 8.0.8. I was able to move forward adding the "SslMode=none" in the connection string.
You will endup with something like:
server={0};user id={1};password={2};persistsecurityinfo=True;port={3};database={4};SslMode=none
(replacing the values with your database details)
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