[From the Profiler docs](https://reactjs.org/docs/profiler.html#onrender-callback):

> The Profiler requires an onRender function as a prop. React calls this function any time a component within the profiled tree “commits” an update.

However, given:

```jsx
import React from 'react'
import ReactDOM from 'react-dom'

function Counter() {
  const [count, setCount] = React.useState(0)
  const increment = () => setCount(c => c + 1)
  return <button onClick={increment}>{count}</button>
}

function App() {
  return (
    <div>
      <React.Profiler
        id="counter"
        onRender={() => console.log('called')}
      >
        <div>
          Profiled counter
          <Counter />
        </div>
      </React.Profiler>
      <div>
        Unprofiled counter
        <Counter />
      </div>
    </div>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))
```

I'm getting a log when I click on the unprofiled counter.

Reproduction: https://codesandbox.io/s/react-codesandbox-tnff6

Am I misunderstanding this API, or is this a bug?
}
        let renderer;
        
        throwInOnWorkScheduled = true;
        expect(() => {
          SchedulerTracing.unstable_trace(
            'event',
            Scheduler.unstable_now(),
            () => {
              renderer = ReactTestRenderer.create(<Component>fail</Component>, {
                unstable_isConcurrent: true,
              });
            },
          );
        }).toThrow('Expected error onWorkScheduled');
        expect(Scheduler).toFlushAndYield(['Component:fail']);
        throwInOnWorkScheduled = false;
        expect(onWorkScheduled).toHaveBeenCalled();
        
        renderer = ReactTestRenderer.create(<Component>succeed</Component>, {
          unstable_isConcurrent: true,
        });
        expect(Scheduler).toFlushAndYield(['Component:succeed']);
        const tree = renderer.toTree();
        expect(tree.type).toBe(Component);
        expect(tree.props.children).toBe('succeed');
      });
      it('should cover errors thrown in onWorkStarted', () => {
        function Component({children}) {
          Scheduler.unstable_yieldValue('Component:' + children);