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.
warnInvalidContextAccess();
      return readContext(context, observedBits);
    },
    useCallback<T>(callback: T, deps: Array<mixed> | void | null): T {
      currentHookNameInDev = 'useCallback';
      warnInvalidHookAccess();
      mountHookTypesDev();
      return mountCallback(callback, deps);
    },
    useContext<T>(
      context: ReactContext<T>,
      observedBits: void | number | boolean,
    ): T {
      currentHookNameInDev = 'useContext';
      warnInvalidHookAccess();
      mountHookTypesDev();
      return readContext(context, observedBits);
    },
    useEffect(
      create: () => (() => void) | void,
      deps: Array<mixed> | void | null,
    ): void {
      currentHookNameInDev = 'useEffect';
      warnInvalidHookAccess();
      mountHookTypesDev();
      return mountEffect(create, deps);
    },
    useImperativeHandle<T>(
      ref: {|current: T | null|} | ((inst: T | null) => mixed) | null | void,
      create: () => T,