PerInstanceRandom does not work on Instanced Static Meshes spawned at runtime

PerInstanceRandom does not provide a random value when the material is being used on an Instanced Static Mesh that is spawned at runtime, the value is always the same.

Regression?: Yes
This did not occur in 4.16.3-3561208+++UE4+Release-4.16

Versions tested:
4.16.3-3561208+++UE4+Release-4.16 - Did not occur
4.17.0-3573198+++UE4+Release-4.17 - Occurred
4.18.0-3575318+++UE4+Main - Occurred

1. Download the attached project
2. Open the project
3. Press play
   Result: The Instanced Static Meshes spawned on Begin Play are not having their Emissive Color randomized by PerInstanceRandom. The ones spawned on Construction are.
   Expected: All of the shown Instanced Static Meshes have their Emissive Color randomized by PerInstanceRandom.

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