Black Ops Cold War has only graced the fandom for a week and while the reaction has been mixed, annoying bugs are everywhere. It's to be expected with any type of game launch, and with such a massive multiplayer game, things are going to break from time to time.
While each iteration keeps things similar to save that Call of Duty feel, the individual games try to do a few things differently to make it stand out. This time around, the scorestreaks were targeted and changed around. That may or may not have led to this bug.
Posted on Reddit and clipped from Twitch, CoD player DiamondRyce showed a rather unusual situation. As he dies, the announcer talks about an enemy chopper entering the map. It gets killed rather quickly, then an ally chopper shows up, giving DiamondRyce kill credit for the kills. Ryce is as confused as his teammates as they had no time to call in or even earn a chopper of their own.
It seems some type of glitched appeared and rewarded the team with their own chopper once the enemy one was taken out. Since the glitch wasn't flushed out, it's hard to tell what exactly caused the bug.