Cannot export double-byte characters in pre tags to PDF

Environment

• Confirmed on Firefox and Chrome

Steps to Reproduce

1. In the editor of Confluence, enter some double-byte characters(ex. あいうえお)
2. Set the type of that character to "Preformatted"
   
3. Export page in PDF

Expected Results

The PDF contains あいうえお

Actual Results

The PDF doesn't contain あいうえお

Workaround

• Use the print function provided by the browser
• Change the text setting to other types such as "paragraph"