Current questions and answers regarding the map editor.

Scout, try to create the icon step by step, as described in this topic. That's how I made mine, and I had no problems with them.

Added 9 minutes later
Besides, esteemed Jack_of_shadows has already attached a ready-made version here. You open the map, upload the files to its resources for replacement, and then click Close in the editor so that the map is packed and the resource changes are saved. After that, you can test it in the game.