Variant manager resets Material Properties Values to default

When creating a new Material property for an actor in a variant set, you can change the value of it, but it resets to the default material of the mesh as soon as you move on to another actor in the list.

1. Create new Variant Set.
2. Add a couple mesh actors to the set.
3. Add a Material property.
4. Fill in the value with another material.
5. Click on another actor from the set, then go back to the first actor.

Results: The material goes back to the default.

Expected: The material should stay as whatever it gets set to.