Darkness Dragon despawning in Investigate Utopia Complex

[VeiledOwl]

In Investigate Utopia Complex, the final mission of Erin West's arc, Darkness Dragon consistently despawns after the phone call ambush.

 

I ran the arc multiple times (with all Alpha Team members at high like points so they remain loyal), and noticed that unlike the other members, Darkness Dragon had no lines of dialog for defeating the bosses at the end. So I ran it again, keeping her targeted most of the time to figure out where I lost her, and it turned out to be the ambush. After she says "Oh heck no! There's no way I'm betraying my bestie!", she does the Victory emote and fades into nothingness. She doesn't reappear until the ending cutscene.

 

Which I suppose does keep her from having to fight you, but seems like it might be a bug.