Duplicated objects receive an invalid white material after changing floors during duplication

Description:
When duplicating objects, changing the active floor using the U or J shortcuts before confirming the duplication causes the duplicated objects to receive an unexpected white material.

Steps to reproduce:

1. Select one or more objects

2. Start duplicating them

3. Before confirming the duplication, press U or J to change the active floor

4. Confirm the duplication

Actual behavior:
The duplicated objects are assigned an unexpected white material.

Expected behavior:
Changing the active floor during the duplication process should not affect the materials of the duplicated objects. They should retain the same materials as the original objects.

Using the U or J shortcuts before confirming the duplication should change the objects’s floor attribution.