Hello,
I encountered an interesting bug today. I logged into the game 5 minutes before the World Boss was supposed to respawn. When I pressed “M” to see the map, the boss respawn location was not visible. I checked all the spots, and although there was information on the left side of the map stating the boss would spawn in 5 minutes, there was no icon on the map. I then teleported to a random city, pressed “M” again, and the icon appeared. I verified this by using the “Waypoint” and the icon appeared there as well. It looks like a bug.