It's not a bug. It's a request for a clearer feature.

When you are about to teleport from a ruin to another, you have no idae where the avaiable ruins are. You have to move the mouse upon it to see the Big Blue Arrow.

It would be really good to see the ruins clearer on the map, in my opinion.

At least those who we've already bloomed... It'd be great if they add an Icon over the tunnels...