I was actually getting this two days ago VERY often (In the middle of an SF with some street sweep mishies)... But not today.
I saw that happen a few times in beta, /bugged it, looks like they haven't fixed it, though.
this is the worst bug because you can't even dismiss the minions.
I haven't experienced it yet (crossing fingers).
But have been on plenty of teams with other MMs and saw it happen. I was even on one of my MM's last night doing some missions to convert to blue side and didn't have any issues. I hope they track down what the issue is since it appears very frustrating.
You have to rezone to fix it, or just lure some enemies to them and have them kill the minions.
If it's obvious that my pets suffer the zoning bug because they aren't moving, I just /release_pets. BOOM! They're dismissed, and I can still resummon.
Not sure if it is random, but in the short time I have had to play, every time I zone with my pets: from one play zone to play zone such as Cap to Shark or from zone to internal instance, my pets stay at the zone in and refuse to move or attack. When I dismiss them, they are still there and I cannot resummon them.
Just me? Because I am getting really irritated, I have been getting so used to not summoning them every mission.
@Boerewors