Markdown output produce extra # in heading

[hulvat]

📝 Provide detailed reproduction steps (if any)

1. Go to https://ckeditor.com/docs/ckeditor5/latest/features/markdown.html
2. Click on source in editor
3. Text The Markdown language is marked as ## , but it is heading 1 so should have only one #

✔️ Expected result

# The Markdown language

❌ Actual result

## The Markdown language

[DJ-Andrey-sXe]

Possibly, not a markdown bug.

1. About header levels: https://ckeditor.com/docs/ckeditor5/latest/features/headings.html#heading-levels
2. What to try: Handle h1 even if editor is configured to support h2+ #2455 (comment)

[CKEditorBot]

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[CKEditorBot]

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