BUG? The field "TTL" is not supported by Step Functions (via Route 53: ChangeResourceRecordSets SDK)

Need some help with below please.

{
"ChangeBatch": {  	
    "Changes": [
  	{
   	 "Action": "UPSERT",
   	 "ResourceRecordSet": {
   	   "TTL": "60",
   	   "Type": "TXT",
   	   "Name": "aaa",
   	   "ResourceRecords": [
   	     {
   	       "Value": "bbb"
   	     }
   	   ]
   	 }
  	}
	]
},
"HostedZoneId": "ccc"
}

I remove "TTL" and I get following:

    	{
"error": "Route53.InvalidInputException",
"cause": "Invalid request: Expected exactly one of [AliasTarget, all of [TTL, and ResourceRecords], or TrafficPolicyInstanceId], but found none in Change with [Action=UPSERT, Name=sup, Type=TXT, SetIdentifier=null] (Service: Route53, Status Code: 400, Request ID: 888466b9-9f91-4a5d-89d3-bcb503e10868)"
}