Talk about underground map, I don't know it bug or I just miss something. Underground way between farmstead and cave and underground way from Vicoria cave is missing from the map. But I still can travel to these place normally by click at spots on the map. This happen in my second play.
Edit; I fix it! I just need to unlock a cave near the bridge where troll exist.
By the way, I just came to know there a way from old crypt to Munbury complex. Thank!