PDF export Resulting to Broken Emoticons

Steps to Reproduce:

1. Create a page with the following icons
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2. Saved
3. Export the page to PDF
4. Icons broke in PDF format as describe on the following screenshot
   

Expected Results:

Confluence should export the page to PDF without any issue and all icons should be rendered fine in PDF format.

Actual Results:

Confluence not able to exported the icons correctly in PDF format as proved by the attached PDF file as an example.