I think this is more of a problem with the API. The default values appear on the screen when you are creating an issue, but if you use the API to create an issue, even if you provide no value for that field, it doesn't appear to use the default value configured in the field config scheme. Also seems related to https://jira.atlassian.com/browse/JRA-26896.
I think you will have to duplicate the logic to set the CF in the additional actions section.
I could be wrong, I haven't tried to reproduce.
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