There are actually three fields that need to get set when you finish/close an Epic - The Status field, the Epic Status field, and the Resolution.
Make sure that you have a post function that sets both the Epic Status and the Resolution to Done when you change the Status to Done (or Epic-Closed or whatever your status name is).
If you already heard about Smart Commits in Bitbucket, know that you just stumbled upon something even better (and smarter!): Genius Commits by Better DevOps Automation for Jira Data Center (+ Server...
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