Hello wrongalot. I took a look at a few pictures of other 1984 S proof Jefferson nickels and they all had that gap in the roof line so I am tempted to say it is the normal design of the coin. I'm not positive though. The rest of the group is way more experienced and could give you a better idea. ErrorsRCool.
I got a new 1971-S proof nickel today, and I noticed that almost all of the railing details had been erased by die polishing. It reminded me of this thread, so I thought I would add a few pics in case any future searchers wondered if that were normal on proof nickels.
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