I dont know what is the threshold for this bug, maybe 50, but I had had just 1 Saved Location before uploading 52 more. I could not see the farthest from my present location. As a test I added one more being even farther than the previous farthest, and the previous farthest has appeared in the list, while the new farthest is not visible.
So to avoid it one has to use a FAKE_Loc being just in the opposite spot of our globe. ;-)
Just to clarify it I speak about Menu/Navigation/Saved Locations.