PDF Export does not export emoticons or render it badly

Symptom

Page's PDF Export missing emoticons or renderring emoticon badly.

Steps to reproduce

1. Install Confluence 6.8.x
2. Create pages containing both emoticons and table . eg:
   • emoticon and text only
   • emoticon within table cells
   • emoticon before and table table
3. View Storage Format for the page and Emoticon will appear like below

   //snippet
   <ac:emoticon ac:name="minus" />
   

1. Export to PDF for all pages
2. Edit page without making any changes
3. View Storage Format for the page and Emoticon will appear like below

   //snippet
   <img class="emoticon emoticon-smile" title="(smile)" src="http://localhost:8090/s/en_GB/7701/445126ab56584205167f1c035c86df495c7c4192/_/images/icons/emoticons/smile.svg" alt="(smile)" border="0" />
   

1. Export to PDF the second times

Expected Results

All emoticons exported correctly.

Actual Results

• Emoticons are not rendered in the PDF export for page that was never being edited before
• Emoticons are renderred badly for pages that was edited before

Notes:

• This is not reproducible with Confluence 6.7.0
• This test was done with Confluence 6.8.1 . PDF export was done via Chrome and Firefox
• Similar symptom when doing Space PDF Export