Yeah it's probably in an indentation of the border trapped between 2 walls. If you have the arrows displaying, they will toggle back and forth but there is no room for circle to move enough to change position.
Here is one that got stuck, I am surprised it is a peninsula not a bay.
The arrows toggled with only a fraction of a change between them.
Here is one that got stuck, I am surprised it is a peninsula not a bay.
The arrows toggled with only a fraction of a change between them.
b = b + ...