When placing multiple respawn position modules in the Eden editor and starting the mission as a multiplayer mission, only one respawn marker is shown on the briefing screen of the player hosting the mission. Other players don't see any respawn markers on the briefing screen. When starting the mission only the person hosting will see respawn marker of his side on the map, although markers are set to "show to everyone". Other players can't see the markers on their map.
Tested on current stable candidate as well as on RC.