eslint-plugin-react: [BUG] react/prop-types - false positive when returning null

I’m trying to update 7.20.0 to 7.20.3, but I have new false positive errors for components that can return null.

This is telling me 'number' is missing in props validationeslintreact/prop-types:

import React from 'react';

type Props = {
  number: number;
};

export default (props: Props) => {
  const { number } = props;

  if (number === 0) {
    return <p>Number is 0</p>;
  }

  return null;
};

But this is fine:

import React from 'react';

type Props = {
  number: number;
};

export default (props: Props) => {
  const { number } = props;

  if (number === 0) {
    return <p>Number is 0</p>;
  }

  return <p>Number is not 0</p>;
};