Thanks!
Turns out I had a save right before I entered the church and so we managed to backtrack and unbug the quest! We are now fighting beyond the forcefield at the bottom of the church, is this supposed to be the end? Or only the beginning? It still feels like only the beginning of the game but we sunk almost 20 hours into it! That's pretty spectacular, I hope there are plenty more quests to do and places to see...
It's the end of the beta but only the end of the first of four areas in the final game. So there is much more to come!
And it's nice to know that entering Evelyn's cave before enteriny the crypt in fact solves the problem. That should give Larian quite enough information to actually fix this bug with zombie Jake...
