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Question about Spine:

The following issue occurs when we upgrade Spine 2.1 to 3.8 at Unity 2018.3.5f1
Sample code:
SkeletonAnimation anim;
anim.state.SetAnimation(0, "Idle", true);
anim.state.SetAnimation(1, "Attack", false);

Circumstances under Spine 2.1
Play Idle

Attack

Idle
Loop normally
(Attachment: Spine2.3_2.gif)

Circumstances under Spine3.8
Play Idle

Attack

Nothing happens
Seems that track 1 still running might be the cause
(Attachment: Spine3.8_2.gif)

Does anyone know what could be causing this?

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Could you please try adding the following line to your code, to enqueue the empty animation after the attack animation:

anim.state.AddEmptyAnimation(1, 0.0f, 0.0f); // mixDuration and delay both set to 0.0

This should mix out your animation on track 1.

var anim = GetComponent<SkeletonAnimation>();
anim.state.End += trackEntry => {
if (trackEntry.TrackIndex == 1)
{
// do something...
}
};

anim.state.SetAnimation(0, "Idle", true);
anim.state.SetAnimation(1, "Attack", false);
anim.state.AddEmptyAnimation(1, 0.0f, 0.0f);

After we adjusted the code as the method above, the animation works.
Play Idle

Attack

Idle

However, "AddEmptyAnimation()" will sent "End event" when the animation is done playing
Which leads to the "do something..." logic to execute again.

Will this problem be fixed, or it will be adjusted to add into "AddEmptyAnimation()" ?

auer_spine wrote

Will this problem be fixed, or it will be adjusted to add into "AddEmptyAnimation()" ?

Sending the End event is by design, please see the API reference page here:
AnimationStateListener
So I fear that you will need to adapt your code accordingly. Note that you can query trackEntry.Animation to react differently according to the animation that just ended.