I am not sure, let's hope they don't. You can only wait with patience that's all. I can only give you my experience which was that they put me in CSS because when they ran my name on their criminal database or something it popped up...but that was what i could understand or decode from cbsa notes only. Sometimes they don't even need a reason and just put you in CSS. I am really not sure how it works. In the end worrying about it won't help, rest assured if you have not done anything wrong then you don't have anything to worry about. It's just a matter of time. If you can get the US embassy to send you an official email or document admitting it's a mistake on their end, you can then forward that as proof to IRCC, which will help strengthen your case. Good luck!
The US embassy said because of privacy laws they can't reveal too much too me. They will never admit such a mistake in writing to me. They said migration officers should contact us and that's what I wrote in the reply. They have no way to prove the allegations against me and so my laywer has argued in the end that if the 5-year ban is applied even though I'm innocent we will go for a judicial review. However I think I should gain pr without much hiccups from now. Only worried about that CSS, but you're right can't do anything about it.