Redux-toolkit (immer) test coverage

I'm using redux-toolkit for my app, it allows write mutable reducers, but Jest doesn't collect coverage for mutable store changes:

export const slice = createSlice({
  name: "auth",
  initialState,
  reducers: {
    authorize:(draftState, action) => {
      draftState.authorized = true;
    }
  }
});

if change it to immutable

export const slice = createSlice({
      name: "auth",
      initialState,
      reducers: {
        authorize:(state, action) => {
          return {
            ...state,
            authorized: true,
          }

        }
      }
    });

jest show that this reducer covered by tests

Do you know any ways how to make test coverage with Redux-toolkit (immer.js)