When enabling option multi-column page, heading level won't be preserved in export.
Steps to reproduce
Create a Confluence page with page layout enabled.
Add some content including headings (use attached content).
Enable the option 'Keep multi-column page layouts' in export dialog and do an export.
*Expected result:* Heading formatting (font/numbering) is preserved in the export.
Actual result: Heading formatting (font/numbering) is not preserved.
Currently, to prevent the formatting issues users would be required to disable the export option Keep multi-column page layouts in the template.