Thank you for telling me about this bug! I'm experiencing this myself recently and I'm not too sure why it's happening so I will look into this more. Though it doesn't affect the game too much.
I'm sorry about the lack of direction and the lack of meaningful NPC to talk to. I just generically wrote the NPC to fit the story in some way. I couldn't think about how each npc would react so it was rushed. This is a great feedback for me to work on those points when I polish the demo more. I wanted the players to figure out and explore what to do as the map is relatively small, but you did give me strong points as there were unmarked buildings. I'll be sure to add those visuals for the buildings. And I'll guide players a bit more but not too much next time.