It seems in the latest experimental that if you go far enough the map wraps right back around, even through the overland map shows that something different should be there.
When I was travelling west towards a mansion, I got to the mansion, and to my surprise there was a lab that I had partially looted in the east. Continuing on I discovered the map had wrapped around to my starting position, even though I hadn’t travelled far, even though the map showed that I should be knee deep in swampland, not on a road.
I’ve noticed these little glitches here and there… roads that should be forest, according to overland map, and forest that should be roads… etc.
Hopefully others can confirm?