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.
const queue = hook.queue;
  invariant(
    queue !== null,
    'Should have a queue. This is likely a bug in React. Please file an issue.',
  );
  queue.lastRenderedReducer = reducer;
  const current: Hook = (currentHook: any);
  
  let baseQueue = current.baseQueue;
  
  const pendingQueue = queue.pending;
  if (pendingQueue !== null) {
    
    
    if (baseQueue !== null) {
      
      const baseFirst = baseQueue.next;
      const pendingFirst = pendingQueue.next;
      baseQueue.next = pendingFirst;
      pendingQueue.next = baseFirst;
    }
    if (__DEV__) {
      if (current.baseQueue !== baseQueue) {
        
        
        console.error(
          'Internal error: Expected work-in-progress queue to be a clone. ' +
            'This is a bug in React.',
        );
      }