Duplicated child object changes scale if parent scale variables are not equal and child rotation are not equal to 0 or 90.

Reproduction steps:
1. Open project.
2. Open scene "Scene"
3. Press on object "Test1" child Cube and duplicate it.
4. Compare normal and duplicated Cube scale values.
5. Repeat 3 and 4 steps with "Test2" and "Test3".

Expected result: Values stays the same.
Actual result: Scale changed.

It does not happen when:
Parent scale x is equal to Parent scale y and it is equal to Parent scale z;
Child rotation x, y and z are equal to -90, 0, 90, 180...

Project attached.