Not sure which the issue is, but since so many old and original missions work with Thief Gold and Newdark, I'm not going to worry too much about this one. I believe I "completed" it, but the objectives won't update even though I've verified that I've read the correct text that should advance the plot.

Still, I dove deep in the single-textured depths and worked my way through a very uninteresting maze to finally find a neat church and most of the loot, along with what the objectives are supposed to be. It's cramped in some places and too big (with not enough detail for the size) in others. The lack of details in a "maze" is a problem for me.

It's simple and workable save whatever problem I encountered that wouldn't update my objectives and let me finish. Aside from the functionality issue, its very bland over all. Great effort put into it, but not alot of 'love'.

Yeah, it seems that on TTLG thread there is also a similar suggestion.