*Strobe warning* UE5 Transform Arrows are Emissive when camera is moving?

BIG STROBE WARNING

The red, green, blue transform arrows seem to be emissive and causing some strange strobey behaviour. Not only this, a light source is obviously sourced at the same point as the arrows are centred around, causing Lumen (I think) to cast wonderfully ray traced and bounced red, green and blue light around the world. It only happens when moving the camera.

Video showing issue: https://we.tl/t-FYziXlnBZp