Multiple window functions don't generate correct sorting criterias

create table t1 (

pk int primary key,

a int,

b int,

c char(10),

d decimal(10, 3),

e real

);

insert into t1 values

( 1, 0, 1,    'one',    0.1,  0.001),

( 2, 0, 2,    'two',    0.2,  0.002),

( 3, 0, 3,    'three',  0.3,  0.003),

( 4, 1, 2,    'three',  0.4,  0.004),

( 5, 1, 1,    'two',    0.5,  0.005),

( 6, 1, 1,    'one',    0.6,  0.006),

( 7, 2, NULL, 'n_one',  0.5,  0.007),

( 8, 2, 1,    'n_two',  NULL, 0.008),

( 9, 2, 2,    NULL,     0.7,  0.009),

(10, 2, 0,    'n_four', 0.8,  0.010),

(11, 2, 10,   NULL,     0.9,  NULL);

select pk, a,

nth_value(pk, 1) over (partition by a order by pk ROWS between 1 preceding and 1 following),

nth_value(pk, 1) over (order by a RANGE BETWEEN 1 preceding and 1 following)

from t1;

EXPLAIN

{

  "query_block": {

    "select_id": 1,

    "window_functions_computation": {

      "sorts": {

        "filesort": {

          "sort_key": "t1.a"

        }

      },

      "temporary_table": {

        "table": {

          "table_name": "t1",

          "access_type": "ALL",

          "rows": 11,

          "filtered": 100

        }

      }

    }

  }

}