Repro: https://codesandbox.io/s/fast-water-4i4jb

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
const context = React.useContext(MyContext);
      const [state, setState] = React.useState({count: context});
      React.useDebugValue(state.count);
      setStateFn = setState;
      return state.count;
    }
    function MyComponent() {
      const count = useCustomHook();
      return <div>count:{count}</div>;
    }
    const renderer = ReactTestRenderer.create(<MyComponent />);
    expect(renderer.toJSON()).toEqual({
      type: 'div',
      props: {},
      children: ['count:', '1'],
    });
    const fiber = renderer.root.findByType(MyComponent)._currentFiber();
    const tree = ReactDebugTools.inspectHooksOfFiber(fiber);
    const stateHook = tree[0].subHooks[1];
    expect(stateHook.isStateEditable).toBe(true);
    if (__DEV__) {
      overrideHookState(fiber, stateHook.id, ['count'], 10);
      expect(renderer.toJSON()).toEqual({
        type: 'div',
        props: {},
        children: ['count:', '10'],
      });