Take *.domain.com as the CN of Wildcard certificates in the LE extension
At the moment the CN of the wildcard certificate is still domain.com and not *.domain.com. The wildcard is just in the alternative domain names.
Please use the wildcard as the CN
Could you tell us which scenarios you want to enable with this functionality? In other words, why the current scheme is not suitable for you?
Michael Rittmeister commented
Because it's confusing for me that my certificate's name is domain.com. Even it's a wildcard certificate and as you can see on many sites like google.com usally the name of a wildcard certificate is *.domain.com