Forums direct message link does not display the message

If click all the way down to a specific message in Forums, there's a "copy link" button. After copying the URL from that button then pasting it into a new browser tab, it doesn't show that message. instead it just shows the main Forums page.

https://trunk-mysql.nightly.sakaiproject.org/portal/site/0f5b9d2d-46c5-4746-a49e-6b697d54ff02/tool/e8807803-5aeb-47b1-8b1f-2b2e04e7a907/discussionForum/message/dfViewMessageDirect?forumId=44&topicId=193&messageId=2

here's the error from the logs