Same problem here!
I didn’t have time to find out why the pinned panner stopped following the selected track, but the duplicating of tracks is something I use a lot, so it will probably be the same problem.
Really frustrating when you are panning a track that is different than the track you think it is……
I did a repro and yes, it happens with duplicating a track.
You can work a round by going to a non-duplicated track (after duplicating a track), switch off the pin (lock) function, switch on the pin function and than go the duplicated track. It now follows the in function again (in my system).
This is still a problem on my set in N6.5.35…
Anyone else still having the same pinned panner problems with duplicating a track in a 5.1 project?
When will this be fixed?