In "Clear the Air", the encounter specifies a standard control sitrep and specifies what happens in the case of a PC victory or defeat. However, the standard control sitrep also has a potential Draw conclusion, which "forces both sides to withdraw", per the Core Book.
While I can obviously make a ruling in my own game as to what happens in the event of a draw here, it's notable that the module does not in its current form seem to consider the possibility and provides no direction in this event, forcing a GM running it directly out of the book to decide arbitrarily whether an equal number of control points at the end of Round 6 counts as a PC victory or PC defeat.