I didn’t know NSW had a restriction on even general discussion without it being an explicit agenda item.
To be honest, I don’t know if there is a specific law about that but I do know that most professional strata managers jump on it very quickly, if only for the sake of clarity.
It is all too easy for an item that comes up under Any Other Business to be discussed and even voted on, or at least achieve a general consensus, and then make it’s way on to the minutes at which point someone will want to know why it wasn’t on the agenda