Calling play() on freshly added tween stops it from playing

[michal-bures]

Version

• Phaser Version: 3.24.1
• Operating system: Ubuntu 18.04

Description

The docs for Tween.play() say "If the Tween is already playing, calling this method again will have no effect."
However as demonstrated by the standalone test case below, superfluously calling Tween.play() immediately after it was added with scene.tweens.add will actually prevent the tween from playing.

Example Test Code

const config = {
  width: 800, 
  height: 600,
  scene: {
    create,
  },
};
const game = new Phaser.Game(config);

function create() {

  const circle = this.add.circle(100,100,20, 0xffffff);
  const tween = this.tweens.add({
    targets: circle,
    duration: 1000,
    x: 400,
    loop: -1
  })
  tween.play()
}

Expected result: circle moves
Actual result: circle remains in place (until you remove the tween.play() line)

[TwentyPast4]

This is a pretty serious problem since it is so counter-intuitive. Still happens in version 3.55

[photonstorm]

Thank you for submitting this issue. We have fixed this and the fix has been pushed to the master branch. It will be part of the next release. If you get time to build and test it for yourself we would appreciate that.