Technical BUG Quest disappeared

I was doing a chain of quests, the last of which was this one: https://www.wowhead.com/tbc/quest=98...ate-bloodsport
but the last quest disappeared and i cant get pre-raid relic on my holy paladin (https://www.wowhead.com/tbc/item=256...ook-of-nagrand)
it happened like this:
we were in a party of 3 people, 2 of whom had this quest, I have autoloot in the settings, my teammate quickly looted and at the moment when I started looting to get the quest item he clicked to skin him, the quest item got bugged, it seemed to be put in my inventory but immediately disappeared, along with it my quest in the quest log disappeared, I tried to kill the elite mob again, but nothing dropped, and I can no longer take the quest from the NPC

npc + quest log: https://imgur.com/a/94rlrm7