PoE2 "Trial of Corruption" Tusk Horn Disappearing

Title says it all- I Killed the boss - I am 100% sure I tried to collect the item and now its gone - still stuck on the same progression for "A Theft of Ivory" (its still telling me to collect it) and even after killing the boss AGAIN it didnt drop. in other words my character is completely bricked until this is fixed- character name in question is "WitchBlastoast"