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I think I found something... Seems that the game data has been reset to "zero" on White March installation or the last update. This means that you dont own caed nua (but you do) so you can't talk with the Steward until you complete the mission (but you can't access that mission cause is already done and you are in another chapter).
I figured that cause I went to cyad nial (was that the name?) the first place were Thaos exectued the ritual (just when you start the game and get out of the cave), i was there looking for a bounty and know what: I found the carbonized figure in front of the machine, Thaos and 3 people more... YES! exactly the escene have seen on the game start! but you can't interact with them.
Also
There is another thing that corroborates my theory . Lot of areas still being unexplored... But I already explored them! on the beggining I thought that happens cause I started chapter 3 and "things have changed" in the world, but seeing all the bugs maybe a "reset" of variables/data could be the answer for all this problems."
I agree, Got extacly same issues, and I also thought that these things are related with the plot, but right now, while im tryin' to start white march, I totally agree that's the problem.
I'm not sure what's the cause and how to solve problem in general, but maybe, while so many people are waiting, you'll find out some solution to reach White March grounds without Stewart, or somethin'.