Labyrinth Enchant Skull Bugg?

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opmanzano wrote:

I understand this as a bug and something worth a fix but i'm trying to figure out why would someone head back to the lab without using the enchant sukll and letting the instance expire.

Perhaps if someone had bypassed the optional treasure keys elsewhere in the lab and backtracked for them after the fight. The devs are aware of the issue and should have a fix in future (it also affected the Altar of Ascendancy)