Purple lighting from blue hologlobe?

Development Rendering
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Hello! I have a hologlobe set up (Additive material) that seems to cause purple light whenever white light is shone on it. Removing it makes the lighting work as expected.

Is this a quirk that’s always been here, or something introduced in 4.15 preview, and how can it be solved? Thanks.

OS: macOS 10.12.2
Using UE4 4.15 Preview 2

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Looks to be the same as this question: Wrong colors in 4.15P1 - Rendering - Unreal Engine Forums