My code to create a custom world runs with no problems in 1.15.1.

I updated to 1.15.2 and The chunks form my world are not generated anymore. After some debugging I figure out that the method "generateChunkData" of the ChunkGenerator is not called at all.

Excerpt from the onEnable method()

WorldCreator worldCreator = new WorldCreator("newworld");

worldCreator.generateStructures(false); 

worldCreator.environment(Environment.NORMAL);

worldCreator.type(org.bukkit.WorldType.FLAT); 

worldCreator.generator(new MyChunkGen());

World world = worldCreator.createWorld(); 

world.setSpawnLocation(0, 4, 0);

I don't get any error messages. The world is generated but the chunks are not created as they don't call my generator.

Thanks for your help