`getContextChangedKeys` only handles class components:
https://github.com/facebook/react/blob/355591add41c0f6dad738fdb1b6603e0786b7b4e/packages/react-devtools-shared/src/backend/renderer.js#L1276-L1304
const SymbolContext = createContext(contextData.symbol);
SymbolContext.displayName = 'SymbolContext';
const NullContext = createContext(null);
NullContext.displayName = 'NullContext';
const UndefinedContext = createContext(undefined);
UndefinedContext.displayName = 'UndefinedContext';
class ModernContextType extends Component<any> {
  static contextType = ModernContext;
  render() {
    return formatContextForDisplay('ModernContextType', this.context);
  }
}
function FunctionalContextConsumer() {
  const value = useContext(StringContext);
  return formatContextForDisplay('FunctionalContextConsumer', value);
}
export default function Contexts() {
  return (
    <div>
      <h1>Contexts</h1>
      <ul>
        <LegacyContextProvider>
          <LegacyContextConsumer />
        </LegacyContextProvider>
        <ModernContext.Provider value={contextData}>
          <ModernContext.Consumer>
            {value => formatContextForDisplay('ModernContext.Consumer', value)}
          </ModernContext.Consumer>
          <ModernContextType />
        </ModernContext.Provider>