Transform behavior of attachments is abnormal when scaling the parent actor along a single axis.

Here are gif screenshots of the different results in UE and Unity of the same operations.

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1. Attach actor B and actor C to actor A.
2. Rotate actor B 30 degrees for example.
3. Scale actor A along the x axis.
4. We would notice actor B is scaling in it's local space, not in actor A's local space as expected.