The bug
plains_meeting_point_4 and plains_meeting_point_5 are in the houses folder instead of the town_centers folder. It's very inconsistent because plains_meeting_point_1, plains_meeting_point_2 and plains_meeting_point_3 are all in the town_centers folder.
This is intended. This for example gives the possibility to have two market places in one village. Thanks for reporting though! 🙂