Following up my previous post on AI Flight behavior with one on Mastermind pet, allied pet, and temporary pet behaviors.
Conclusion: Mastermind Pet commands worked as intended while using Group Fly.
Testing proceeded as follows: From a distance, while using Defensive stance, I targeted an enemy then clicked Attack My Target. Mastermind pets engaged quickly by initially getting in to melee range and then using ranged attacks as they cycled through their attacks. Once the targeted enemy was defeated, they moved on to other targets that I selected. At the end of the engagement, the Mastermind pets returned to my side. Behavior appears normal.
Using the Aggressive stance, the Mastermind pets attacked enemies which I used Attack My Target on. They continued to attack until the enemies in the area were defeated. Behavior appears normal.
Moving on to Prestige and temporary pets...
Behavior appears similar (subjectively exactly the same even) to how Prestige and temporary pets without Group Fly behave. If they have ranged attacks, they use them and if they have melee attacks, they use them as well. Tested using Signature Summon (Ranged Damage, Melee Damage, Support, and Tank) along with Back Up Radio (PPD Reinforcement) pet summon.