Refraction not working with MakeMaterialAttributes

When setting a material to Use Material Attributes and then feeding in a Refraction value with MakeMaterialAttributes, the refraction doesn't work properly

Reported in 4.8, but I tested in Main as well and got the same results.

(See attached images)
1. Create a material as shown with refraction of 1.5
2. Assign to a mesh and note the refraction effect
3. Create another material as shown in the second image with the same settings, but using MakeMaterialAttributes instead
4. Assign to a mesh and note that there is no refraction effect

Fix UE-51650

Status update on UE-21075 and UE-20622?

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