Well I have some problems when doing cave/dungeon quest, killing skeleton for the spanish priests. Problem to get an update when going through the light. Cartagena and Santa Catalina Maybie I did them to close up to another quest (Austin quest) Maybie I was too quick for the game. I went to Austin in the pearl divers. But there where no Austin, but I finished the priest quest in the cave on the the way, to him, headed back to the priest , and got my blessing.
Belzburg,
It seems you are confusing different quests into one.
Austin quest has nothing to do with priests, and the "undead light" is very specific in this quest to a specific location unlike other caves in its positioning overall, well its unique.
There is NO priest quest in this cave, as its not anywhere close to a town and never will be given for this location.
Additionally, you may not know this but there are TWO Pearl Diver Villages in the game not just ONE, one in the north and one in the south near San Juan del Norte.
The village in the north is tied to the Ship of Souls and Sharp's Spy quests.
The one in the south is tied to Austin quest.
The only way you will know this is if you have a Map of Santa Catalina and the text from the FINAL robber.
Plus, if you have not encountered all SIX robbers in the various locations around the map and actually discovered the location of Austin and searched every house in this village (he is only in one specific wooden house), he will not even appear.
The "light" will not block the exit either in the cave before you get to him.
This quest is completely functional (and has been in nearly every mod), albeit this is one of those very obscure, difficult quests that provides no clues or updates.
Most never see the end of this quest in game, either because they give up or do not know there is more to the quest line.
This reminds me of humor of watching "One F Jef" on Youtube playing AoP2 and trying to defeat Edward Low (Pirate Quest Line #4), and giving up after multiple attempts because the quest is "just too hard". Yep, this is another hard quest, especially at lower levels if you have no fighter companions, cannot follow vague clues, and ultimately a very small crew during the final battle.
Good keyboard banging memories when this game came out five years ago.
This game can be very unforgiving and completely unbalanced at times regardless of which mod you play, in some ways just like the real world.