We tried to get the quest from the angry miner. She did not give a key or potons, as she said she had. Then we went to a wrong place and thought it was the quest area, and ended the quest. But we still had it in our journals as unfinished, and then got to the quest area later with another player who had to take it separately. We killed bugs, but there was no winged creature and so no wings to give. Still there was a possibility to choose the option that we had the wings, and so end the quest succesfully.

Should be fixed.