Single Fetch: returning `null` from resource route loader leads to error about remix HOT 2 CLOSED

Argument of type '({ request }: LoaderArgs) => Promise<TypedResponse<null>>' is not assignable to parameter of type 'Loader'.
  Type 'Promise<TypedResponse<null>>' is not assignable to type 'MaybePromise<DataFunctionReturnValue>'.
    Type 'Promise<TypedResponse<null>>' is not assignable to type '{ [key: string]: Serializable; [key: number]: Serializable; [key: symbol]: Serializable; } | Map<Serializable, Serializable> | Set<...> | Promise<...> | Promise<...>'.
      Type 'Promise<TypedResponse<null>>' is not assignable to type 'Promise<Serializable>'.
        Type 'TypedResponse<null>' is not assignable to type 'Serializable'.
          Type 'TypedResponse<null>' is not assignable to type '{ [key: string]: Serializable; [key: number]: Serializable; [key: symbol]: Serializable; }'.
            Property 'headers' is incompatible with index signature.
              Type 'Headers' is not assignable to type 'Serializable'.
                Type 'Headers' is not assignable to type '{ [key: string]: Serializable; [key: number]: Serializable; [key: symbol]: Serializable; }'.
                  Index signature for type 'string' is missing in type 'Headers'.```