Sandbox: https://codesandbox.io/s/cranky-kapitsa-op3jh

Repro: type "a" and then after a second "b"

Expected: Eventually you'll see "ab" in all fields. Pending "..." indicator goes away.

Actual: You'll keep seeing "a" in low pri field. Pending "..." indicator is stuck.
let numberOfReRenders: number = 0;
    do {
      workInProgress.expirationTime = NoWork;
      invariant(
        numberOfReRenders < RE_RENDER_LIMIT,
        'Too many re-renders. React limits the number of renders to prevent ' +
          'an infinite loop.',
      );
      numberOfReRenders += 1;
      if (__DEV__) {
        
        
        ignorePreviousDependencies = false;
      }
      
      currentHook = null;
      workInProgressHook = null;
      workInProgress.updateQueue = null;
      if (__DEV__) {
        
        hookTypesUpdateIndexDev = -1;
      }
      ReactCurrentDispatcher.current = __DEV__
        ? HooksDispatcherOnRerenderInDEV
        : HooksDispatcherOnRerender;
      children = Component(props, secondArg);
    } while (workInProgress.expirationTime === renderExpirationTime);
  }