In the scene during the resonance cascade when the player is teleported to the Xen area and the four vorts approach, once they came forward the two on the left disappeared. I reloaded the map and it didn’t reoccur, but it was odd so I thought I’d report it. Be interesting to know if anyone had a similar bug.
You’re not alone, this occured to me just yesterday, as well.
Thought it was kind of strange, though… They were moving their hands like they’re praying and Poof! two (2) of them were gone. O_o
Was one of those ‘Nope!’ moments, I guess.
I was originally summing this up for my ‘Bug-Report’, but now that appears to be redundant. 
Nice find, by the way!
I didn’t have ANY vorts during the cascade, i went to a blank screen and then came back to the busted test chamber.
I assumed that section had been snipped as it used xen items (admittedly a tiny one) and the devs weren’t giving any hints to their xen creation yet.
I had the same problem, just it was one vort only
Happened to me too. Was the only level where this happened. Some would just disappear. Some would fall through the floor.
Wow, disappearing vorts, vorts falling through the floor… quite the Unforeseen Consequences indeed 
That’s not even the half of it. As far as I remember that level had more glitches in it than any other level…