@Friebel I totally get why this would seem unintuitive in your scenario.    Explanation and complicating factors In general, Timelines (except the global one) can't have animations with NEGATIVE start times. In other words, children can't be placed before the very start of the timeline. There are several reasons:  animation.progress(0) would become meaningless. As soon as a timeline has an infinitely repeating animation, it effectively has no start or end theoretically. Cur
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