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Turns out it's the matter of 3D model (or at least replacing with new 3D model can fix it). The original model contains a scope type (I don't know what does it mean in Reality Compose Pro). I use this model as .usdz and drag and drop to my scene. But it seems like this "scope" hierarchy has blocked the model to use its parent's anchor. Which I think with literal understanding, "scope" means it is not "controlled" by its parent?