Export to PDF in another language does not work with preformatted text

Summary

When trying to export a Confluence page in another languague (say russian) to PDF, it will ignore all text that is using code blocks or that is preformatted.

Steps to Reproduce

1. Install another language package into Confluence, e.g.: arial-atlassian.ttf (instructions)
2. Create a page on Confluence with russian characters. E.g.:

   <pre>adsccas</pre>
   <p>фывфыв</p>
   <pre>фывфыв</pre>
   <p>&nbsp;</p>
   <pre>var blabla=1; //русский комментарий.</pre>
   <p>&nbsp;</p><ac:structured-macro ac:name="code" ac:schema-version="1" ac:macro-id="6c08de39-8d94-45af-ab61-a5c5c23566c0"><ac:parameter ac:name="language">js</ac:parameter><ac:parameter ac:name="title">test block</ac:parameter><ac:parameter ac:name="linenumbers">true</ac:parameter><ac:plain-text-body><![CDATA[var blabla=1; //русский комментарий.]]></ac:plain-text-body></ac:structured-macro>

3. Export this page to pdf

Expected Results

File should be exported with all the content on the page.

Actual Results

File is missing some texts (preformatted and in code blocks ones)

Page:

Export:

Workaround

Use the regular paragraph format on those texts. Or, specify the following CSS to Global PDF Stylesheet:

pre, .panel .panelContent pre {
  font-family: ConfluenceInstalledFont, sans-serif;
}

div.codeContent.panelContent pre, .code pre, .preformatted pre, tt, kbd, code, samp {
  font-family: ConfluenceInstalledFont, monospace !important;
}