Message Subject not used with SNS destination

Plugins Alerting
1

When I create a trigger and configure the corresponding action via AWS SNS destination, the received json doesn’t contain any message subject, that I enter in the “Message subject” field below the “Destination name”.

Message subject:

Test

Message body:

Monitor {{ctx.monitor.name}} just entered alert status. Please investigate the issue.
- Trigger: {{ctx.trigger.name}}
- Severity: {{ctx.trigger.severity}}
- Period start: {{ctx.periodStart}}
- Period end: {{ctx.periodEnd}}

Received json in AWS Lambda:

{
    "Records": [
        {
            "EventVersion": "1.0",
            "EventSubscriptionArn": "arn:aws:sns:...",
            "EventSource": "aws:sns",
            "Sns": {
                "SignatureVersion": "1",
                "Timestamp": "2019-07-10T09:26:07.631Z",
                "Signature": "...",
                "SigningCertUrl": "https://sns....",
                "MessageId": "myMessageId",
                "Message": "Monitor myMonitor just entered alert status. Please investigate the issue.\n- Trigger: MyTrigger\n- Severity: 1\n- Period start: 2019-07-10T09:11:07.586Z\n- Period end: 2019-07-10T09:26:07.586Z",
                "MessageAttributes": {},
                "Type": "Notification",
                "UnsubscribeUrl": "https://sns...",
                "TopicArn": "arn:aws:sns...",
                "Subject": null
            }
        }
    ]
}

Any clue when this will be fixed?
Kind regards