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Can you please let me know which mode you are using for comment text mode or visual mode as on both modes I am able to see that it's working as expected.
I have past experience with visual mode where some extra lines are get added on the bottom when code block macro is used in Jira comment.
Can you try adding a paragraph of 5-6 lines and see if add as a new lines or not, because sometime these issues are wired but fix by changing the modes and then comment.
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