I suspect this may be a kind of memory layout issue in `AnimationEventDispatcher` because I added a new filed in `Variant<CssAnimationData, CssTransitionData, WebAnimationData>`. And I probably saw some issues that we mismatch the data type before, e.g. A `CSSTransition` object but it uses `WebAnimationData`.
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I suspect this may be a kind of memory layout issue in `AnimationEventDispatcher` because I added a new field in `Variant<CssAnimationData, CssTransitionData, WebAnimationData>`. And I probably saw some issues that we mismatch the data type before, e.g. A `CSSTransition` object but it uses `WebAnimationData`.