What is the danger of damage to the wire in the wall?

Hello dear electricians. Help in my stupid situation. Calm me down. I came to help parents with repairs. She plastered the strobin. Inadvertently damaged a section of the electric wire (she cut a small section of insulation and touched the copper wires, they broke slightly from the edge). Dad came, plastered over the rotband with plaster. He said that it’s not scary. But I'm scared. What does this threaten?

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