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Light Function Material Broken 4.19

In 4.19 I’ve added a light function material to a spotlight and in PIE without a light build it projects the image from a render target/scene capture 2d

When I build lighting the projected image no longer is projected from the spotlight.

Any suggestions?

I tried this in 4.19 Light Functions | Unreal Engine Documentation and the flicker works in PIE but as soon as you build lighting it stops working/flickering.

unbuilt lights are basically dynamic lights until you build lighting. static lights do not support light functions, have you got it set to movable or stationary?

Thankyou, set it to movable did the trick