If a link that is inline oneboxed is followed by a period, any characters other than a whitespace character that immediately follow the period are added to the inline onebox’s path (here is an example of that https://meta.discourse.org/tags.) Clicking the link will return the not-found page.
The markup used for the above link is https://meta.discourse.org/tags.)
I’m seeing this behaviour using the latest Chrome browser on Ubuntu.