Vehicle Showcase- Easy to reproduce:
1- Either attack from the front or back of "Camp Rogain"
2- Take out ANY NPC (I've also taken out the sniper in the middle of the base)
3- Alarm raises and AI come within 30-40m of your position. Sometimes they even pass by you even when they know where you are.
SCUBA Showcase- Only had it happen once. Working on reproduction.