@Storm already had reported on this from OG a while ago but I actually found all the dungeons grouped exactly like this
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Most of you can tell that it is separated by Leide, Duscae and Cleigne.
What's interesting is you can see an additional Dungeon after Pitioss Ruins called Aeretylian Furnace, apparently located in Cleigne.
I had talked to
@Storm before about it, and while it could very well just be a cut dungeon, its also possible that it is a new dungeon to be added to the game.
THEORY TIMEEEEEEE:
My (hopeful) theory is that since we don't know where we get the Founder King's Sigil to active Armiger Unleashed, its possible that you unlock this dungeon in Cleigne to get it once you get all 13 Royal Arms. Maybe its a boat only location (both ARE part of the Royal Pack, and would put the ship to good use if anything) that you discover? Its either that, or this location is simply a cut dungeon and Royal Sigil is found elsewhere (Insomnia?).
I will say though that I have yet to find any significant cut stuff in the text files. Basically everything is in the game (and I've scrolled a hell of a lot the past 2 days) that I've seen, save for any Royal Pack stuff or some other dialogue for other chapters OG had found first (that is entirely unknown if it is cut or just hasn't been added yet).
This is why I'm hopeful that those 5 Leide locations and this dungeon are not cut content.
Edit: Both are in the Benchmark and the Demo from Monday