Material is not replaced by default material after .udatasmith file reimport.

Steps to reproduce:

1. Import MaterialTestCubes_all_assigned.udatasmith,
2. Reimport with MaterialTestCubes_all_assigned for reimport (with shuffle).udatasmith

Expected: top and bottom side of the cube should be reimported with default material.

Actual: materials remain in place.

Error code R-1618

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