Please help me explain why FractalPlugin was initialized twice. Is the first initialization necessary?

Phaser 3
1 
class FractalPlugin extends Phaser.Plugins.ScenePlugin {

    constructor (scene, pluginManager)
    {
        console.log('1', scene)
        super(scene, pluginManager);
    }

    start() {
        console.log('start1')
    }

    boot ()
    {
        console.log('boot1')
    }

}

class Main extends Phaser.Scene
{
    constructor ()
    {
        super({key:'Main'});
    }

    create() {
        console.log('Main')
    }

}

const config = {
    type: Phaser.AUTO,
    parent: 'phaser-example',
    width: 800,
    height: 600,
    plugins: {
        scene: [
            { key: 'fractalPlugin',start:true, plugin: FractalPlugin }
        ]
    },
    scene: [Main]
};

let game = new Phaser.Game(config);

image
image1378×430 30.3 KB

Please help me explain why FractalPlugin was initialized twice. Is the first initialization necessary?

2

The first is from the system scene. You can ignore it.