Well, I already had a pre-Broken Circle bug world state in my DAI slot. Now, what would happen if I hadn't logged into the Keep today, they decided to leave it 'bugged' (or say it's not bugged) then what would happen to that save that is in the slot? You can't modify a save in the slot, you need to edit it, then export it again.
I don't understand your question.
When the Keep exports World State One, World state One is considered valid(otherwise it wouldn't be allowed to be exported). If the Keep team edits the Keep, that fixes/causes issues, your original World State One is still on the servers, waiting to be uploaded, and completely unchanged by whatever edit occurred. That only changes if/when you select "export to DAI" again with any of your world states...
It's been a known bug for a long time, long before even DA2 was released. You leave the Sloth Demon chamber then reenter and the party selection screen pops up and you can remove her. But, when you get up to the room before the Harrowing Chamber and talk to Cullen, you hear Wynne's disembodied voice objecting, but since she's not there, you can't fight her. So you don't. Then you go to the Harrowing Chamber. SO yeah, it's a bug. Don't need the Keep staff to verify that. However, that only matters with the "sided with Cullen" part, if you "try" to save the mages but don't cause you 'forgot' to use the Litany, they don't force you to kill Wynne, and Wynne accepts that you tried. It's all there in the dialogue.
Whatever. While I'd prefer to hear what you're saying, if it is true, from someone who actually works on DA in some capacity, I'm not going to argue about it anymore.
So long as I am still able to kill Wynne, Refuse Cullen, and Kill Irving, I'll be happy(and since that's currently in my exported world state, I am).