Core boss essences drop is bugged

so the boss showed essences in the first phase for sure, in the heart phase i didnt look how much he showed, but he dropped 2 wailing ones, and none of the deafening it had in first phase.
i assume its 2 bosses for the coding purposes, but the three unique mobs you need to kill first didnt have essences on them, so just make first phase boss not a map boss, because you cannot actually kill him.