[Xrystal]

spawned and summoned aren't quite the same but result in the same effect.

Imagine you're in a vehicle of some sort or a mount .. then you dismount too close to a mob .. possible combat scenario .. pet spawns with no problems ( as this is a part of blizzard coding ) bar has problems because the addon in question is having problems showing it due to combat taint .. combat stops .. it appears.

However, I also get this affect when not in combat .. same scenario though such as dismounting or landing from an auto flight. Sometimes there are mere milliseconds before the bar spawns .. perhaps due to some of their experimental coding on secure functions .. only time will tell.