I have the same issue on my 15". Just purchased a few days ago. I don't want to take it back as mine is already set up a I like it. Lot's of work. Migration doesn't quite bring "everything" over it seems.
I wonder if there's a "fix". If I manually move the latch out (both can be moved freely by hand) and close the lid, I can see it being magnetically attracted to the catch. Strange...