When I rerender a component with "defaultChecked" or "defaultValue" react fails to update the "value" and "checked" attribute accordingly.

Before you say "use a controlled input" I would argue that this is a bug as it basically disallows uncontrolled forms with "reset" buttons. (It will always reset to whatever the initial default value was).

if (this._rootNodeID) {
    
    ReactDOMTextarea.updateWrapper(this);
  }
}
function warnIfValueIsNull(props) {
  if (props != null && props.value === null && !didWarnValueNull) {
    warning(
      false,
      '`value` prop on `textarea` should not be null. ' +
      'Consider using the empty string to clear the component or `undefined` ' +
      'for uncontrolled components.'
    );
    didWarnValueNull = true;
  }
}
/**
 * Implements a <textarea> host component that allows setting `value`, and
 * `defaultValue`. This differs from the traditional DOM API because value is
 * usually set as PCDATA children.
 *