Trying to understand ser vs estar past participle

I never quite understood using ser and estar with present participles.

For example I saw the sentence la comida esta preparada. But nothing can change the food being prepared. So why is not es? Same thing with la estatua está hecha de madera. It will always be made from wood so why not es? In fact it’s la estatua es de madera.

submitted by /u/trumpdump409
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