Simulacrums - Unkillable monsters that stop progression of waves?

Today (22/10/2025, 1:30pm NZDT) I ran two back to back Simulacrums on my character (Mercenaries league)

Both were in the Broken Bridge zone, and both suffered from 2-3 unkillable, untargetable monsters at the end of the very first wave. I started the instances with my BAMA build but tried logging into my Righteous Fire (no trargeting) character to kill the monsters and no luck.

Just trying it again, this time pulled hysteriagate and same result. 1 wave of monsters, then 3 that I can't kill or target.