Thieves among us - Mines - No Soraks appear, nor a body after killing the demons

I get into the mines. I'm supposed to fight Soraks that do not appear. Then I get to the "secret" area, kill some demons and battle mages - and then nothing happens. According to a walkthrough I found you should fight the soraks, visit the secret area and kill the the demons, and a body should appear. After the fight with the demons there's also no body to be found. This quest is broken :-(. This has also been reported by several people onthe Steam Forums.