Why is my thumbnail preview in the Material Editor not displaying my resulted material? I can open other (existing) materials, and their preview displays fine. But ones that I make aren' t!

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Hello Parabellumx8086, welcome to the Unreal community.

This is quite common as this occurs when materials have blends. There isn’t an error with your material from what I can tell.

Here is a brilliant answer posted by RecourseDesign

I hope this helps.