Refraction not calculated when using Material Property Overrides Blend Mode

Found in the process of replicating the linked Answerhub. When an opaque material is setup as a master material with the intent to have an Opaque and Translucent version, the material instance will correctly use the Opacity settings but will not calculate any refraction even if setup in Master Material.

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1. Open QAGame Editor
2. Create a New Material
3. Assign a Vector3 (0,1,0) to Base Color
4. Assign a Scalar (0.2) to the greyed out Opacity
5. Assign a LERP node to the greyed out Refraction
6. Set the Const A in the LERP node to 1
7. Set the Const B in the LERP node to 1.33
8. Assign a Fresnel Node to the LERP node's Alpha
9. Compile and Save Material
10. Create a Material Instance of the new Material
11. In the Material Instance, set the Material Property Overrides Blend Mode to Translucent
12. Place a Sphere in the Level, so that Refraction would be clearly seen (the edge of the Platform works)
13. Assign the Material Instance to the Sphere

RESULTS: No Refraction is seen

EXPECTED: Refraction should be seen

Refractions stop working when material attributes are used