Why _on_AnimatedSprite_animation_finished() not work?

Question

Hello everyone! I have an animated animation of AnimatedSprite2d in which my character begins to run 2 frames, and what I want is that as soon as this animation ends, another one starts in a loop but it does not work, the first animation instead of ending simply loops itself, I ask for your help, here is my code

func _on_AnimatedSprite_animation_finished(): 
    if ($AnimatedSprite.animation == "run"):
            $AnimatedSprite.play("running")


func anim_ctrl():
    if velocity.x > 0:
        $AnimatedSprite.flip_h = false
        $AnimatedSprite.play("run")
    elif velocity.x < 0:
        $AnimatedSprite.flip_h = true
        $AnimatedSprite.play("run")
    else:
        $AnimatedSprite.play("idle")

Answer 1

I think it will not finish because it is loop (run animation )

So disable run loop (when run finish it will play running )