I played several games in Advance mode (the GRB version) and noticed that the RP boosters are not taking into account for that game mode : rewards are standard and the “Missions left” counter of the booster doesn’t change after the game.
I don’t think they are counted in this. Whilst they are counted in the Naval EC, this I’m sure is different.
(It should actually be more clear in the game somewhere)
Boosters are not active in “Advance” Event.
(so even if you activate one and join the event, your booster will stay as it was).