Nested spreads not getting parsed from MachineConfig objects

[NixBiks]

The following example

import { createMachine, MachineConfig } from "xstate";

type Context = { name: string };
type Event = { type: "CHANGE_NAME"; name: string };

const config: MachineConfig<Context, any, Event> = {
  states: {
    a: { always: { target: "b" } },
    b: { type: "final" },
  },
};

const machine = createMachine<Context, Event>({
  initial: "A",
  states: {
    A: { ...config },
    B: { ...config, states: { ...config.states, c: {} } },
  },
});

parses to

[
  {
    "initial": "A",
    "states": {
      "A": {
        "states": {
          "a": {
            "always": {
              "target": "b"
            }
          },
          "b": {
            "type": "final"
          }
        }
      },
      "B": {
        "states": {
          "c": {}
        }
      }
    }
  }
]

instead of

[
  {
    "initial": "A",
    "states": {
      "A": {
        "states": {
          "a": {
            "always": {
              "target": "b"
            }
          },
          "b": {
            "type": "final"
          }
        }
      },
      "B": {
        "states": {
          "a": {
            "always": {
              "target": "b"
            }
          },
          "b": {
            "type": "final"
          },
          "c": {}
        }
      }
    }
  }
]