Code generator fails to generate bindings for leafrefs that target a leaf with union type

grouping state-top {
    leaf index {
      type union {
        type enumeration {
          enum ALL;
        }
        type uint32;
      }
    }
  }  grouping g {
    list l {
      container state {
        uses state-top;
      }
      leaf index {
        type leafref {
          path "../state/index";
        }
      }
    }
  }