To address the issue of transparent parts of a SkeletonGraphic asset registering events in Unity, you can try disabling the Cull Transparent Mesh option in the CanvasRenderer component of the SkeletonGraphic. This setting can sometimes cause unexpected behavior with transparency and event registration. Additionally, ensure that your material settings are correctly configured for the SkeletonGraphic component, as it uses a CanvasRenderer instead of a MeshRenderer. You might also want to check if the Event Trigger component is set up correctly and consider using a custom hit test to ignore transparent areas.
