I've seen posts about this before, so when I was playing this afternoon, I looked for it.  In the game I was playing I noticed three goodie huts near each other that didn't show on the cloth map, so I saved the game, and then though about posting the same. First I tried opening the saved game up again to see if the problem reproduced.

Interestingly, the goodie huts showed on the cloth map when I opened the saved game.

For me this means two things, first, we can't make a saved game to submit to show this problem, second, the problem people have been posting where there are goodie huts appearing that weren't there before when they opened a saved game may be this same bug.  The huts may have been there before, but not shown on the cloth map.