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.
useEvent(event: ReactListenerEvent): ReactListenerMap {
      currentHookNameInDev = 'useEvent';
      updateHookTypesDev();
      return updateEventListener(event);
    },
    useOpaqueIdentifier(): OpaqueIDType | void {
      currentHookNameInDev = 'useOpaqueIdentifier';
      updateHookTypesDev();
      return updateOpaqueIdentifier();
    },
  };
  HooksDispatcherOnRerenderInDEV = {
    readContext<T>(
      context: ReactContext<T>,
      observedBits: void | number | boolean,
    ): T {
      return readContext(context, observedBits);
    },
    useCallback<T>(callback: T, deps: Array<mixed> | void | null): T {
      currentHookNameInDev = 'useCallback';
      updateHookTypesDev();
      return updateCallback(callback, deps);
    },
    useContext<T>(
      context: ReactContext<T>,
      observedBits: void | number | boolean,
    ): T {
      currentHookNameInDev = 'useContext';
      updateHookTypesDev();
      return readContext(context, observedBits);