Bug horn crafting/loot The Trail of Corruption Quest

Hello, it is the 2nd character that is bugged in Poe 2 when creating the horn (I kill the boo for the first time, it drops the horn, I go with the portal and when I am in the caravan I no longer have it and I cannot transform it ) I have tried to kill him 3 times, killing the witch first, the mammoth first and nothing, I have gone to the gates of Halani to complete the map again to have the storm and then use the portal and nothing, I have tried the same thing but killing the mammoth and he doesn't throw it at me either...


And if I have tried to go with the caravan to all the points on all the maps and Zarka does not appear it does not give me any option either and with the first character I have also killed the boos 5 times alone with a friend with a friend who had the mission and I drop it and nothing I have even tried to kill the mammoth and the witch wing at the same time and nothing

Also say that this forum account is not the steam account since I did not link it