Equipping fractures with slug attachments will still be devastating to infantry but does zero dmg to vehicles
I've said this ones... I'll say it again... It FREAKING SLUG AMMO ON A ROCKET! Why wouldn't you think it was a bug in the first place.
It is not a rocket. It uses an armor piercing dart, not a rocket. Armor piercing darts use kinetic energy (ie velocity) to penetrate armor and usually do not use any kind of external power source other than the initial propellant charge. Slugs work with the Fracture because of that fact, it simply uses a larger slug for AI purposes.