When spawning or teleporting to world loaded by plugins (my creative and games map)

The world has 15 of view distance.

Loaded with this code :

WorldCreator creator = WorldCreator.name("world_games");
creator.type(WorldType.FLAT);
creator.generateStructures(false);
world = Bukkit.createWorld(creator);

world.setGameRule(GameRule.DO_DAYLIGHT_CYCLE, false);
world.setGameRule(GameRule.DO_FIRE_TICK, false);
world.setGameRule(GameRule.DO_WEATHER_CYCLE, false);
world.setGameRule(GameRule.MOB_GRIEFING, false);

world.setGameRule(GameRule.RANDOM_TICK_SPEED, 0);
world.setTime(6000);

The map load the first 9 chunk normally, and the chunk at 10 chunk from my spawn point is loaded only where i was close to it (1 chunk).

All other chunk never load, i can only load the 20chunk² around my spawn point.

If i quit and join, do the same and my new spawn point is the center of this new loaded area.

I tried before and after the commit called "Fix loading secondary worlds", no change.

I have only one plugins, mine, managing many part of the server, but doesn't affect the chunk loading for this map (custom generator for creative map, but same problem).