Same thing happened to me today (March 16, 2022). The Dichotomy collection was the main reason I completed the meta, so it was very frustrating to spend all that time and come away without progressing the collection.
I would just like to add this bug can also occur in a private squad (it happened to group I was in). I'm hoping for a fix soon, because I will not be repeating the experience until this bug has been corrected.
Just adding my voice to this report. I try to run this meta often, and it is very frustrating that it fails because of bugged NPCs. Please fix soon. Thanks!