React checkboxes. State is late when toggling the checkboxes

I have a group of 3 checkboxes and the main checkbox for checking those 3 checkboxes.

• When I select all 3 checkboxes I want for main checkbox to become checked.
• When I check those 3 checkboxes nothing happens but when I then uncheck one of those trees the main checkbox becomes checked.

Can someone explain to me what actually is happening behind the scenes and help me somehow to solve this mystery of React state? Thanks!

Here is a code snnipet:

state = {
  data: [
    { checked: false, id: 1 },
    { checked: false, id: 2 },
    { checked: false, id: 3 }
  ],
  main: false,
}

onCheckboxChange = id => {
  const data = [...this.state.data];

  data.forEach(item => {
    if (item.id === id) {
      item.checked = !item.checked;
    }
  })

  const everyCheckBoxIsTrue = checkbox.every(item => item === true);

  this.setState({ data: data, main: everyCheckBoxIsTrue });
}

onMainCheckBoxChange = () => {
  let data = [...this.state.data];

  data.forEach(item => {
    !this.state.main ? item.checked = true : item.checked = false
  })

  this.setState({
    this.state.main: !this.state.main,
    this.state.data: data,
  });
}

render () {
  const checkbox = this.state.data.map(item => (
      <input
        type="checkbox"
        checked={item.checked}
        onChange={() => this.onCheckboxChange(item.id)}
      />
    ))
  }

return (
  <input type="checkbox" name="main" checked={this.state.main} onChange={this.onMainCheckBoxChange} />
  {checkbox}
)