I have seen a similar issue related to the creating of the map and the zooming of the map. I am able to do these things fine without crashing. I am also able to take my empty maps to certain areas just fine and completely fill it out. However, certain areas will cause the server to crash and boot everyone when I am traveling with a empty map.

My exact situation is that I have a wall in my base with 6 1:4 zoomed maps on the wall. I am traveling with a 1:4 zoomed map to try to fill them all out. all of them seem to work fine, until I try a map that is for a territory that is mostly savannah. everytime I travel through this land and try to fill out the map it eventually crashes in approximately the same area. It is a savannah area where I get disconnected.

To my knowledge this issue has not been resolved.