Changing material parameter name clear custom instance values

Hi, i’m trying to change a texture parameter name from “Texture” to “Diffuse” but when i do that all instances with custom values are cleared, i have tried restarting the engine. I’m using 5.0.3

It’s not cleared. You can just tick the box, and carry on

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The texture value has changed to default, this issue is happening with a lot of materials

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This is still occuring in UE5.4 with material layers.