Deep Copy and Shallow Copy in Asynchronous Operations

What does this output?

let originalObject = { a: 1, b: { c: 2 } }
let shallowCopy = { ...originalObject }
let deepCopy = JSON.parse(JSON.stringify(originalObject))
originalObject.b.c = 3
console.log(shallowCopy.b.c)
console.log(deepCopy.b.c)

Correct Output

3
2

Why this output?

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