Yseros summons after Taralith.
Even if there are 6 monsters on the field.
I think it skips fighting her entierly but I’m unsure because I did not beat the boss
Edit: Just got it to happen with Friden, I think it tries to summon 3 instead of 2
Edit 2: Saw it was also happening to Horde Nemesis’ as well so it’s just a bug when summoning new enemies that decides to summon more than the maximum amount of creatures in battle.