Timeline's complete event is triggered prematurely before tweens finish

Version

• Phaser Version: 3.90.0
• Operating System: macOS

Description

The Timeline's complete event is triggered before all its tweens have completed.

Example Test Code

class Example extends Phaser.Scene {
    constructor() {
        super();
    }

    preload() {}

    create() {
        const timeline = this.add.timeline();

        const counter = {
            x: 0
        };

        timeline.add({
            at: 0,
            run: () => {
                console.log("Start!");
            }
        });

        timeline.add({
            at: 100,
            tween: {
                targets: counter,
                duration: 3000,
                x: 1000,
                onComplete: () => {
                    console.log("Tween complete: counter.x =", counter.x);
                }
            }
        });

        timeline.on("complete", () => {
            console.log("Timeline complete: counter.x =", counter.x);
        });

        timeline.play();
    }
}

const game = new Phaser.Game({
    type: Phaser.WEBGL,
    parent: 'phaser-example',
    width: 800,
    height: 800,
    scene: Example
});

Expected Behavior

The Timeline's complete event should only be triggered after all tweens within the timeline have completed.

Start by running the JavaScript example from the issue and compare the logged order and counter.x values. Trace the Phaser Timeline completion behavior around the tween, then verify that the Timeline complete event fires only after the tween's onComplete callback and final value are reached.