I happened to notice that React will throw `Hooks can only be called inside the body of a function component` if a sibling element calls `ReactDOMServer.renderToStaticMarkup`. I have a [fiddle](https://jsfiddle.net/er4kL3of/) that shows this behavior (I think you need to manually open your console to see the error).

If you wrap the sibling element in a component or even just assign it a variable, this issue does not occur.

It's easy to get around and is a pretty specific bug, but why might this be happening?


value: props.value != null ? props.value : props.defaultValue,
          checked: props.checked != null ? props.checked : props.defaultChecked,
        },
      );
    } else if (tag === 'textarea') {
      if (__DEV__) {
        ReactControlledValuePropTypes.checkPropTypes('textarea', props);
        if (
          props.value !== undefined &&
          props.defaultValue !== undefined &&
          !didWarnDefaultTextareaValue
        ) {
          warning(
            false,
            'Textarea elements must be either controlled or uncontrolled ' +
              '(specify either the value prop, or the defaultValue prop, but not ' +
              'both). Decide between using a controlled or uncontrolled textarea ' +
              'and remove one of these props. More info: ' +
              'https://fb.me/react-controlled-components',
          );
          didWarnDefaultTextareaValue = true;
        }
      }
      let initialValue = props.value;
      if (initialValue == null) {
        let defaultValue = props.defaultValue;
        
        let textareaChildren = props.children;
        if (textareaChildren != null) {
          if (__DEV__) {