KULEMAKA boss bug! Fix it

After final boss fight, before loot dropped, everything happened in a split second. I killed him first, and my character died immediately. I saw him drop loot. After he died, I returned to checkpoint and ran back to spot, but there was no loot from boss! I couldn't open the portal; the game said there was a boss fight, but he was dead! I was able to leave location and continue killing Kulemak, but this is my only first experience where I couldn't collect boss's loot due to a BUG in game. Unfortunately, I don't have a recording or photo of moment boss died, his loot, or my death. Everything happened so quickly, and I didn't expect it to happen. I couldn't even imagine it. I hope that developers will check this and fix it soon.

1) photo boss dead: https://ibb.co/QFt6bGRb

2) A photo of me clicking on house in menu game "choice hero" and game warning me about losing progress in location (where there were no dropped items). However, when I return there without refreshing location with Ctrl, everything repeats exactly the same: https://ibb.co/fzCwjGrn