Naruna Hot Springs Issue

I was doing the Naruna Hot Springs dungeon on normal and fighting the final boss when he went into his phase transition that looks like a carnival. I brought his health to 0 during this time and he died and the loot dropped there as well. Before it was possible for it to be looted a cutscene occurred preventing me from receiving my rewards. After the cutscene the loot was not back at the normal map as it was still in the carnival phase transition area. So I lost my 300 guardian and 100 destruction stones. Please compensate me accordingly.

NA East
Adrinne
IGN: Kuroshield