Use the Horn of the Vastiri to clear the Sandstorm

Im stuck in act 2 cruel with use the horn of vastiri to clear the sandstorm. I couldn't progress with this quest, probably because i killed boss in halani gates while having horn in my inventory. I tried to fix it by dropping horn to the ground and it disappeared. Can't progress this quest, played 28h already...
Please fix this

I uploaded this to reddit too, hopefully you can solve this soon https://www.reddit.com/r/PathOfExile2/comments/1h9kc85/the_trial_of_corruption_softlock/

same gg. cannot continue in story