config-get command no longer return logger configuration

Used configuration in Kea:

{
    "Dhcp6": {
        "option-data": [],
        "hooks-libraries": [],
        "shared-networks": [],
        "subnet6": [
            {
                "subnet": "3000::/64",
                "pools": [
                    {
                        "pool": "3000::1-3000::f"
                    }
                ],
                "interface": "enp0s9"
            }
        ],
        "interfaces-config": {
            "interfaces": [
                "enp0s9"
            ]
        },
        "control-socket": {
            "socket-type": "unix",
            "socket-name": "/home/wlodek/installed/git/var/run/kea/control_socket"
        },
        "renew-timer": 1000,
        "rebind-timer": 2000,
        "preferred-lifetime": 3000,
        "valid-lifetime": 4000,
        "loggers": [
            {
                "name": "kea-dhcp6",
                "output_options": [
                    {
                        "output": "/home/wlodek/installed/git/var/log/kea.log"
                    }
                ],
                "severity": "DEBUG",
                "debuglevel": 99
            }
        ],
        "lease-database": {
            "type": "memfile"
        },
        "multi-threading": {
            "enable-multi-threading": true,
            "thread-pool-size": 2,
            "packet-queue-size": 16
        }
    }
}

result of config-get command:

[
  {
    "arguments": {
      "Dhcp6": {
        "calculate-tee-times": true,
        "control-socket": {
          "socket-name": "/home/wlodek/installed/git/var/run/kea/control_socket",
          "socket-type": "unix"
        },
        "ddns-generated-prefix": "myhost",
        "ddns-override-client-update": false,
        "ddns-override-no-update": false,
        "ddns-qualifying-suffix": "",
        "ddns-replace-client-name": "never",
        "ddns-send-updates": true,
        "ddns-update-on-renew": false,
        "ddns-use-conflict-resolution": true,
        "decline-probation-period": 86400,
        "dhcp-ddns": {
          "enable-updates": false,
          "max-queue-size": 1024,
          "ncr-format": "JSON",
          "ncr-protocol": "UDP",
          "sender-ip": "0.0.0.0",
          "sender-port": 0,
          "server-ip": "127.0.0.1",
          "server-port": 53001
        },
        "dhcp-queue-control": {
          "capacity": 64,
          "enable-queue": false,
          "queue-type": "kea-ring6"
        },
        "dhcp4o6-port": 0,
        "expired-leases-processing": {
          "flush-reclaimed-timer-wait-time": 25,
          "hold-reclaimed-time": 3600,
          "max-reclaim-leases": 100,
          "max-reclaim-time": 250,
          "reclaim-timer-wait-time": 10,
          "unwarned-reclaim-cycles": 5
        },
        "hooks-libraries": [],
        "host-reservation-identifiers": [
          "hw-address",
          "duid"
        ],
        "hostname-char-replacement": "",
        "hostname-char-set": "[^A-Za-z0-9.-]",
        "interfaces-config": {
          "interfaces": [
            "enp0s9"
          ],
          "re-detect": true
        },
        "ip-reservations-unique": true,
        "lease-database": {
          "type": "memfile"
        },
        "mac-sources": [
          "any"
        ],
        "multi-threading": {
          "enable-multi-threading": true,
          "packet-queue-size": 16,
          "thread-pool-size": 2
        },
        "option-data": [],
        "option-def": [],
        "parked-packet-limit": 256,
        "preferred-lifetime": 3000,
        "rebind-timer": 2000,
        "relay-supplied-options": [
          "65"
        ],
        "renew-timer": 1000,
        "reservations-global": false,
        "reservations-in-subnet": true,
        "reservations-out-of-pool": false,
        "sanity-checks": {
          "lease-checks": "warn"
        },
        "server-id": {
          "enterprise-id": 0,
          "htype": 0,
          "identifier": "",
          "persist": true,
          "time": 0,
          "type": "LLT"
        },
        "server-tag": "",
        "shared-networks": [],
        "statistic-default-sample-age": 0,
        "statistic-default-sample-count": 20,
        "store-extended-info": false,
        "subnet6": [
          {
            "calculate-tee-times": true,
            "id": 1,
            "interface": "enp0s9",
            "option-data": [],
            "pd-pools": [],
            "pools": [
              {
                "option-data": [],
                "pool": "3000::1-3000::f"
              }
            ],
            "preferred-lifetime": 3000,
            "rapid-commit": false,
            "rebind-timer": 2000,
            "relay": {
              "ip-addresses": []
            },
            "renew-timer": 1000,
            "reservations": [],
            "store-extended-info": false,
            "subnet": "3000::/64",
            "t1-percent": 0.5,
            "t2-percent": 0.8,
            "valid-lifetime": 4000
          }
        ],
        "t1-percent": 0.5,
        "t2-percent": 0.8,
        "valid-lifetime": 4000
      }
    },
    "result": 0
  }
]

"loggers" list is missing.

We have multiple system tests failures on jenkins, and according to jenkins build history this build is probably cause of problems https://jenkins.aws.isc.org/job/kea-dev/job/tarball-internal/621/