Use the revive template in description.ext of a MPmission.
respawn = 3;
respawnTemplates[] = {"Revive","MenuPosition"};
respawnOnStart = -1;
Put a trigger in the editor with (lifeState unit == "INCAPACITATED") as condition and let the trigger display a hint or blow something up on activation.
Incapacitate yourself (unit) and notice how the trigger is not activated.
Use identical setup for "DEAD_RESPAWN" and notice that that works fine.