PDF export shows links to other pages as full URL instead of inline

Issue Summary

PDF exports show full page URLs instead of inline display when the page name contains "_" without special character

Steps to Reproduce

1. Create page A with any title including "_" ( eg. test_ABC )
2. Create page B and use link macro to create a hyperlink for page A and display configuration should be "inline"
3. Publish page B
4. Edit page B again
5. Publish it again
6. Export page B to pdf

Expected Results

The exported page should show the link as inline display 

Actual Results

The exported page will contain the full URL of page A instead of inline display

Workaround

Either remove the "_" character from the page title else add a special character ( eg. ä) as well ( eg. test_abcä)