At least it's possible to work around this problem. You don't even need to change the settings - by turning on the option to display the production modifiers of the terrain, you can get a sense of what's there relatively easily.
I've noticed that, even when the squares become visible after exploring the center of the map, line-of-sight doesn't seem to function properly. Everything is slightly greyed-out as if it had been explored but wasn't currently visible.
I've noticed that, even when the squares become visible after exploring the center of the map, line-of-sight doesn't seem to function properly. Everything is slightly greyed-out as if it had been explored but wasn't currently visible.