Object3D.clone has a bug

[kekeqy]

When you clone an Object3D object that contains animation, the newly created object cannot be displayed in the scene.

[donmccurdy]

In what sense does the Object3D contain animation? Animations are stored in AnimationClip objects, which can be reused with multiple objects and don’t need to be cloned. Can you share an example?

Related: #14494

[kekeqy]

@donmccurdy I used GLTFLoader to load a.glb file containing the animation, and then cloning had this problem.

[kekeqy]

Objects that contain animation have this problem, even if I'm not playing animation in the scene.

[donmccurdy]

I think you've run into issue #11574 — most likely, one of the Object3D's children is a SkinnedMesh, which can't be cloned without special handling as proposed in #14494.

I'm closing this as a duplicate of #11574, but if you think the issue is different please provide an example or a specific error you see in the console so we can debug.