You saved this map and after you opened it and tested it? Then sorry, but i dont know the solution for this yet. Its a freeroam/editor bug. I've tried to find the solution for that, but i dont really know the editor test mode, i dont know why child elements doesnt appear...
nonono it's not cause of editor bug. The problem is AFTER i set checkpoints/pickups on it they are disapeared. Or better said when i set the map on "race" gamemode. I tested it on local server and there are all the objectpoints with objects disapeared
//e: I can send you the map without checkpoints/pickups, could you try what will happen if you make checkpoints on it and change the mode to race?