I actually think it is due to how urls here are now done. Back in the beta the link for this site would be
[url]https://www.bungie.net/en-US/Forum/Post?id=60029425[/url]
now the link is
[url]https://www.bungie.net/7_Bungieold-links-to-same-topic-when-clicking-quotmo/en-us/Forum/Post?id=60029425[/url]
My guess is due to the change in urls in the new site, the redirecting link on the old site doesn't account for it and got broken.
I don't think so. You can put whatever you want where the thread name is and it will still link to this thread. The PostID has to be the same.
[url=https://www.bungie.net/PowerRangers/en-us/Forum/Post?id=60029425]see[/url]