Issue with Quest in Act 3, Molten Vaults

Hello,

I encountered an issue in Act 3 in Path of Exile 2. After defeating the boss in the "Molten Vaults" area, the boss killed me right after I had already killed them. Upon respawning, I appeared at the upper part of the area and now I can't descend to retrieve the hammer required for the quest.

Could you please advise on what to do in this situation?