It spawned the Aquamirae end boss fight as a random Overworld encounter with bonus Apotheosis affixes, completely outside the context of the Aquarmirae questline and without doing any of the steps for summoning her.
I don't think it should be able to do that, it's a lot like if it randomly spawned a Wither with all the same kind of affixes it'd use to make a skeleton into a bossfight.
It spawned the Aquamirae end boss fight as a random Overworld encounter with bonus Apotheosis affixes, completely outside the context of the Aquarmirae questline and without doing any of the steps for summoning her.
I don't think it should be able to do that, it's a lot like if it randomly spawned a Wither with all the same kind of affixes it'd use to make a skeleton into a bossfight.