Exporting pages to PDF results in incorrect heading formatting for heading 4 and 6

Issue Summary

When we export pages to PDF, both heading 4 and 6 are incorrectly formatted in the resulting export.

Environment

• Confluence Cloud
• Any browser
• Any desktop OS

Steps to Reproduce

1. Create a new page using the New Editing Experience (Fabric editor)
2. Add text
3. format different sections of the text with heading sizes 1, 2, 3, 4, 5, 6
4. Publish page
5. Export this page to pdf

Expected Results

Exported page headings respect original formatting

Actual Results

Heading 4 and 6 will be incorrectly formatted. Both will be bigger than headings above them and will display incorrect bolding, italic and font.

Workaround

No workaround as of today.