Open any project
Create a new Post Process material.
Create this flow of nodes:
WorldPosition->Clamp->Emissive Color (licensee has provided a screenshot)
Add a post process volume, set to unbound.
Under the volume's Blendables/PostProcessMaterials, add a new asset, set the asset reference to the material created above.
The scene will be recoloured with miscoloured texels. (See linked UDN for further details).
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-160274 in the post.