React setState problem

this.state = {
    form:{
        item1:{
            key1:"1",
            key2:"2"
        }
    },
    form2:{
        item2:{...}
    }
}

react, only updates the value of form.item1.key1, how to setState?

this.state = {
    form:{
        item1:{
            key1:"3",
            key2:"2"
        }
    },
    form2:{
        item2:{...}
    }
}
Nov.23,2021
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