when i filter the cart the reducer function return proxy only in redux toolkit

I have tried to remove the product from the cart. here the cart is an array that contains products in the object. when I try to filter the cart in reducer it returns proxy and cannot do filtering while in same thing doing in normal redux do filtering.

reducer function

const initialState = {
  products: [],
  cart: []
};

removeFromCart: (state, action) => {
  return {
    ...state,
    products: [...state.products],
    cart: [state.cart.filter((prod) => prod != action.payload)]
  };
};

remove from cart button

<button
  onClick={() => dispatch(removeFromCart(productData))}
  class="btn btn-danger"
  disabled={stock < 1 ? true : false}
>
  Remove from cart
</button>