Single Message Transform Headers not being filtered out

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Our Single Message Transform (SMT) modifies the message to include the headers in the value field, and as such when we return the newRecord we don’t define any headers:

override fun apply(record: T): T { 
    return record?.let { r -> 
        ... 
        r.newRecord(r.topic(), r.kafkaPartition(), r.keySchema(), r.key(), null, value, r.timestamp()) 
    }
}

According to the class: https://kafka.apache.org/24/javadoc/org/apache/kafka/connect/connector/ConnectRecord.html#ConnectRecord-java.lang.Str[…].lang.Object-java.lang.Long-

Do you have any idea how headers seem to be getting through still?