UI is absent if navigating from pull request to issue

Test steps

• Create an issue
• Create a pull request
• Link from pull request description to an issue
• Refresh the page
• Click on the link

Expected

A button to enable timer appears

Actual

No UI from userscript is visible

This may be caused by an error in script@include URL's: http*://github.com/*/*/poll/* should be http*://github.com/*/*/pull/*