remote-option-def4-get-all return incorrect tag when option definition is configured with "all"

1. kea is configured with:

"Dhcp4": {
        "config-control": {
            "config-databases": [
                {
                    "name": "keadb",
                    "password": "keapass",
                    "type": "mysql",
                    "user": "keauser"
                }
            ]
        },
        "control-socket": {
            "socket-name": "/home/wlodek/installed/git/var/run/kea/control_socket",
            "socket-type": "unix"
        },
        "hooks-libraries": [
            {
                "library": "/home/wlodek/installed/git/lib/kea/hooks/libdhcp_cb_cmds.so"
            },
            {
                "library": "/home/wlodek/installed/git/lib/kea/hooks/libdhcp_mysql_cb.so"
            }
        ],
        "interfaces-config": {
            "interfaces": [
                "enp0s9"
            ]
        },
        "lease-database": {
            "type": "memfile"
        },
        "loggers": [
            {
                "debuglevel": 99,
                "name": "kea-dhcp4",
                "output_options": [
                    {
                        "output": "/home/wlodek/installed/git/var/log/kea.log"
                    }
                ],
                "severity": "DEBUG"
            }
        ],
        "server-tag": "abc"
    }

completely basic.

2. added server-tag "abc" to database.

3. then I'm sending command to set option definition:

{'arguments': {'option-defs': [{'code': 222,
                                'name': 'foo',
                                'type': 'uint32'}],
               'remote': {'type': 'mysql'},
               'server-tags': ['all']},
 'command': 'remote-option-def4-set',
 'service': ['dhcp4']}

response is correct:

  {
    "arguments": {
      "option-defs": [
        {
          "code": 222,
          "space": "dhcp4"
        }
      ]
    },
    "result": 0,
    "text": "DHCPv4 option definition successfully set."
  }

than I'm checking database content:

mysql> select * from dhcp4_option_def;
+----+------+------+-------+------+---------------------+-------+-------------+--------------+--------------+
| id | code | name | space | type | modification_ts     | array | encapsulate | record_types | user_context |
+----+------+------+-------+------+---------------------+-------+-------------+--------------+--------------+
|  1 |  222 | foo  | dhcp4 |    8 | 2019-07-16 09:46:13 |     0 |             | NULL         | NULL         |
+----+------+------+-------+------+---------------------+-------+-------------+--------------+--------------+
1 row in set (0.01 sec)

mysql> select * from dhcp4_option_def_server;
+---------------+-----------+---------------------+
| option_def_id | server_id | modification_ts     |
+---------------+-----------+---------------------+
|             1 |         1 | 2019-07-16 09:46:13 |
+---------------+-----------+---------------------+
1 row in set (0.00 sec)

mysql> select * from dhcp4_server;
+-----+-----+---------------------------+---------------------+
| id  | tag | description               | modification_ts     |
+-----+-----+---------------------------+---------------------+
|   1 | all | special type: all servers | 2019-06-06 07:06:58 |
| 173 | abc |                           | 2019-07-16 09:46:13 |
+-----+-----+---------------------------+---------------------+
2 rows in set (0.01 sec)

all checks out, our new option definition is assigned to tag "all"

4. execute command remote-option-def4-get-all

{'arguments': {'remote': {'type': 'mysql'}, 'server-tags': ['abc']},
 'command': 'remote-option-def4-get-all',
 'service': ['dhcp4']}

and configured option is returned with incorrect tag:

  {
    "arguments": {
      "count": 1,
      "option-defs": [
        {
          "array": false,
          "code": 222,
          "encapsulate": "",
          "metadata": {
            "server-tags": [
              "abc" <<<<<<<<<<<<<<<<<<<< should be "all"
            ]
          },
          "name": "foo",
          "record-types": "",
          "space": "dhcp4",
          "type": "uint32"
        }
      ]
    },
    "result": 0,
    "text": "1 DHCPv4 option definition(s) found."
  }