White flashes in viewport when changing material parameters?!

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Hi guys!
Anyone experience this in 4.25…I get weird white flashes when I change a parameter in the instances of my materials. Its a white flash on the mesh that has the material and then it settles back to normal. I am using the exact same material in 4.24 side by side and there are no such flashes…any clues?

A solution I found is to turn lights to movable which sorts the issue out and back to static…?!

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I’m having a very similar problem I believe. My material has a dirt mask placed over it and I’m changing the parameters of the dirt so it gets clean off. However when the parameters get changed they disappear for a moment and then return which is really jarring. When you say turn the lights to movable is that all of the lights?