I THINK this is new-ish (within past 90 days??) behavior:
I subscribe to a couple of forums/fora, with daily emails listing new and updated threads. I believe that it used to be the case that when a moderator moved a thread that had already been listed in the daily email, my clicking on the link to the original location in the email would redirect to the new location, and I'd be all set.

Several weeks ago, at least, I noticed that when I click on a moved thread, I now get the message that the thread doesn't exist and contact the administrator, with no indication of where the errant thread has gone.

Was there a change? Does anyone care? I liked the old behavior, myself.