Precomputed AO Masks cannot be used to LERP between Normal Maps

When using the Precomputed AO Map node to LERP between 2 Normals, only the A input into LERP will render out on the mesh. The Precomputed AO will work fine for Base Color LERPs

Example:

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1. Open a New Blank Project with No Starter Content
2. Turn on Use Ambient Occlusion and Generate Ambient Occlusion Material in the World Settings
3. Set Direct Illumination Occlusion Fraction and Indirect Illumination Occlusion Fraction to 0
4. Create a New Material
5. In the New Material, Take two normal maps (or a (0,0,1) constant 3 and a normal map) and Lerp them using the Precomputed AO Mask
6. Plug the LERP into the Normal Input
7. Compile and Save Material
8. Place a Sphere halfway through the default Platform
9. Assign the Material to the Sphere
10. Build Lighting

RESULTS: On the A INput of the LERP shows up

EXPECTED: The Normal Map blend together based on LERP alpha

**Quick Repro in Attached Project**

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