Cache is not invalidating

Problem/Motivation

Hi, I've found a problem with cache not being invalidated in some circumstances.

Steps to reproduce

1. Create a new menu.
2. Add some menu link(s) to this menu, but don't enable it(them).
3. Go to /decoupled_kit/menu/{menu-id}. You should see an "empty response".
4. Go back to your menu item(s) and enable it(them).
5. Go back to /decoupled_kit/menu/{menu-id}. You should see an "empty response", instead of the actual one. Clearing the cache solves the problem.

1. Create a new menu.
2. Add some menu link(s) to this menu and enable it(them).
3. Go to /decoupled_kit/menu/{menu-id}. You should see a correct response with your menu item(s).
4. Go back to your menu and disable all of its items.
5. Go back to /decoupled_kit/menu/{menu-id}. You should see an "empty response".
6. Go back to your menu and enable at least one of its items.
7. Go back to /decoupled_kit/menu/{menu-id}. You should see an "empty response", instead of the actual one. Clearing the cache solves the problem.

Empty response:

{
    "id": "custom-menu",
    "data": {
        "#cache": {
            "contexts": [],
            "tags": [],
            "max-age": -1
        }
    }
}