when using React.memo, adding defaultProps changes the component tree

Current behavior

component and component2 are identical: component2 only adds defaultProps, but enzyme treats them differently

// component.js
import PropTypes from 'prop-types';
import React from 'react';
import Child from './child'

const Component = React.memo(function Lazy({type}) {
    return <Child>
        <div>
        </div>
    </Child>;
});

Component.propTypes = {
    type: PropTypes.oneOf(['block', 'inline'])
};

export default Component;

creates tree

    <Memo(Lazy)>
      <Child>
        <div>
          <div />
        </div>
      </Child>
    </Memo(Lazy)>

// component2.js
import PropTypes from 'prop-types';
import React from 'react';
import Child from './child'

const Component = React.memo(function Lazy({type}) {
    return <Child>
        <div>
        </div>
    </Child>;
});

Component.defaultProps = {
    type: 'block'
};

Component.propTypes = {
    type: PropTypes.oneOf(['block', 'inline'])
};

export default Component;

creates tree

    <Lazy type="block">
      <Child>
        <div>
          <div />
        </div>
      </Child>
    </Lazy>

code used to test them:

import React from 'react';
import { configure, mount } from 'enzyme';
import Component from './component';
import Component2 from './component2';
import Adapter from "enzyme-adapter-react-16";

configure({ adapter: new Adapter() });

const comp = mount(<Component />);
const comp2 = mount(<Component2 />)

console.log(comp.debug()); 
console.log(comp2.debug());

API

• shallow
• mount
• render

enzyme version: 3.11.0

library	version
enzyme	3.11.0
react	16.14.0
react-dom	16.14.0
react-test-renderer	16.14.0
adapter (below)

Adapter

• enzyme-adapter-react-16
• enzyme-adapter-react-16.3
• enzyme-adapter-react-16.2
• enzyme-adapter-react-16.1
• enzyme-adapter-react-15
• enzyme-adapter-react-15.4
• enzyme-adapter-react-14
• enzyme-adapter-react-13
• enzyme-adapter-react-helper
• others ( )