Cant enter Kopec Temple - - 1.201.054.631

Cant enter Kopec Tempel.
Yesterday evening i played with another person. This person had lags.
He killed the boss before Kopec Tempel. (I died several times)
I got the green item and activated the door.
Because of his lags he arived city later than me.
So i waited to enter.
When he arrived city the door disapeared but my quest as seen in the screenshot is further.
But as seen in the screenshot the door even activated is not possible to walk thru.
The effect at the door disapeared in the moment the second player in group ported to city.
Because i waited for the second player in group and didnt enter - i have no waypoint to maybe reset an instance.

So Act 3 in my case cant be finished.