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ValueError in z_order_decode due to mismatched return values from key2xyz

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**Bug Description**​ The function key2xyz in `pointcept/models/utils/serialization/z_order.py` returns 4 values (x, y, z, b), but z_order_decode in `pointcept/models/utils/serialization/default.py` only accepts 3 values (x, y, z), causing ValueError: too many values...

### Problem Description​ An error occurs during the displacement projection computation in OctFormer when executing: `pointcept/datasets/transformer.py` `GridSample` ```python if self.project_displacement: displacement = np.sum( displacement * data_dict["normal"], axis=-1, keepdims=True ) ```...