FlxTween.cancelChain() doesn't function correctly if tween has completed

[MondayHopscotch]

• Haxe version: 4.2.4
• Flixel version: 5.2.2
• OpenFL version: 9.2.1
• Lime version: 7.9.0
• Affected targets: All

Code snippet reproducing the issue: https://github.com/MondayHopscotch/TweenTest)https://github.com/MondayHopscotch/TweenTest

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Reproduction steps:

1. Create a tween with chained tweens (Tween.then(Tween))
2. Save initial tween as variable (ex: var mainTween:FlxTween)
3. After parent tween has completed, attempt to call mainTween.cancelChain()

Observed behavior: Tween chain continues despite .cancelChain() being called on parent tween.

Expected behavior: All tweens chained under parent tween are canceled.

In the case of my example project, expected behavior is that the square sprite stops tweening halfway through turning blue.

Extra Context: https://discord.com/channels/162395145352904705/165234904815239168/1069465074219098122

This line is the culprit with how the current default manager operates: https://github.com/HaxeFlixel/flixel/commit/b2436a63ccdb24f431088f06e5c4b06420126dde

[Geokureli]

This is a tough one. Ideally we should delay the destruction of chained tweens until the chain in complete but, truthfully, I don't know if there's a simple solution. commenting out _nextTweenInChain = null; works but that can cause memory leaks. tween chaining is kind of complicated, since you can chain multiple tweens to a single tween but also chain tweens to chained tweens.

I'll need to think about this for a bit