I saw it first in New Caledonia and when was near that place I got very heavy lag and game crashed (this maybe is just a coincidence) and same patrol path going to map border is in Alsace. Not sure if this is correct. See attached images, for Alsace this red part on left side of the map which goes to map border. In case of New Caledonia it is red line on right side of the map. Maybe it is not a bug at all, dunno.