emotion: Typing of props in restyled components is broken in latest build

Big changes were made to the typings in the last few releases. I tried to upgrade from 9.1.3 to 9.2.3, where it appears that inference of props types is broken.

• emotion version: 9.2.3
• react version: 16.4.0
• typescript version: 2.9.1

Relevant code.

import styled from 'react-emotion';
import React from 'react';

interface MyProps {
  className?: string;
  someBehavior: boolean;
}

const MyComponent: React.SFC<MyProps> = ({className}) => <div className={className} />

const MyStyledComponent = styled(MyComponent)`
  border: ${props => props.someBehavior ? 1 : 0}px;
`;

Results in this error:

Property 'someBehavior' does not exist on type '{ theme: any; }'.