I don’t think it works to have Boolio tell Finn and Poe about the spy and for them to act surprised, since from the way they talk about it in later scenes it sounds like everyone already knew that there may be one. Rey asks Poe if there’s a spy or not right before the “Palpatine’s back” scene.

I know that dialogue is in the original film, but considering they say the Falcon still isn’t back and act like they don’t know what’s going on with it, if Finn doesn’t know a spy exists when Boolio mentions it then I don’t see how Rey would know to ask “There’s a spy?” as soon as she walks up, before they had a chance to tell her.