In the Terror of the Tides campaign’s fourth mission, Wrath of the Betrayer, I noticed that the Naga forces in the southern base don’t actually move to attack at all. They build until a sizeable group of units is present in the south, but presumably due to rocks placed and blocking their pathing, they never actually advance north to your holdout, making the mission significantly more simple.
This occurs in Reforged mode. The rocks that block off the southern Naga base are not present in Classic mode.