Couple things I noticed watching someone try and scout multiple systems with active guards tonight.
They moved in with a fleet of four scouts and split it into 4 and headed for four systems with guard fleets active.
One scout got picked off entering a system alerting the player scouting of active guards.
Second fleet was turned around just before intercept and sent out of system to safety. This brings us to bug one. Both fleets were warp six. My guard fleet remained at warp one even though it showed boost was activated and it had fuel.
Third fleet (same issue) ran away to safety while mine stayed at warp one while showing boost active.
Fourth fleet went into a planets orbit within the defense zone of two systems. The guard fleets from both systems locked onto the hidden in orbit scout and would stop and start all the way to that planet it was parked at hidden in orbit.