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When a group rotate, the sprites belong to the group do not detect collision


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Hi, all, I have learned Phaser for a couple of days. I have encountered a weird problem.


In the create() section, 


    this.sets = this.game.add.group();  // sets is a group

    this.sets.x = this.game.world.centerX;
    this.sets.y = this.game.world.centerY+40;
    this.player = this.sets.create(0, 0, 'player'); // add player to sets
    this.arrow = this.sets.create(0, -220, 'arrow'); // add arrow to sets
    this.arrow.body.immovable = true;
    this.sets.setAll('anchor.x', 0.5);
    this.sets.setAll('anchor.y', 0.5);
In the update() section,
    this.game.physics.collide(this.player, this.arrow);
When the player move to the arrow, the collision works well.
But when I rotate the sets, the collision does not work, the player and the arrow can be overlapped. 
Any ideas? Thanks a lot.
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On my experience before, rotating the sprite does not rotate the it's body. Try to render it on canvas and call "render" and see where the body of your sprite, is, to get a better idea.


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