Unable to receive custom audit topics in syslog

Troubleshooting
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After carefully following the guide to implement custom audit topics for Forgerock Identity Gateway (Extend IG :: ForgeRock Identity Gateway), using a JsonAuditEventHandler it does seem to work as intended.

However, the same configuration with no changes does not seem to work for a SyslogAuditEventHandler.

{
  "name": "SyslogAuditService",
  "type": "AuditService",
  "config": {
    "eventHandlers": [
      {
        "class": "org.forgerock.audit.handlers.syslog.SyslogAuditEventHandler",
        "config": {
          "name": "MySyslogAuditEventHandler",
          "topics": [
            "access",
            "OAuth2AccessTopic"
          ],
          "protocol": "UDP",
          "host": "localhost",
          "port": "3333",
          "connectTimeout": 30000,
          "facility": "LOCAL0",
          "severityFieldMappings": [
            {
              "topic": "access",
              "field": "response/status",
              "valueMappings": {
                "FAILED": "INFORMATIONAL",
                "SUCCESSFUL": "INFORMATIONAL"
              }
            }
          ]
        }
      }
    ]
  }
}

The received message contains the custom topic but does not keep any data inside.

<134>1 1715623993276 ab7e210f2889 IG 1570578713 OAuth2AccessEvent [OAuth2AccessTopic.IG@36733 OAuth2Access._id="" OAuth2Access.timestamp="" OAuth2Access.transactionId="" OAuth2Access.eventName="" OAuth2Access.accessToken.scopes="" OAuth2Access.accessToken.expiresAt="" OAuth2Access.accessToken.sub="" OAuth2Access.resource.path="" OAuth2Access.resource.method=""]

Is there any additional configuration that is required for this specific handler for the example to work?