SQS: Resource dependencies are not circular

[alucard001]

I got the following error of circular reference when creating SQS.

[Resource dependencies are not circular] Circular Dependencies for resource SQSSendNotifications. Circular dependency with [SQSSendNotificationsDeadLetterQueue]
Resource dependencies are not circular] Circular Dependencies for resource SQSSendNotificationsDeadLetterQueue. Circular dependency with [SQSSendNotifications]

Here is my CloudFormation file for SQS:

Resources:
  SQSSendNotifications:
    Type: AWS::SQS::Queue
    Properties:
      DeduplicationScope: messageGroup
      FifoQueue: true
      FifoThroughputLimit: perMessageGroupId
      KmsDataKeyReusePeriodSeconds: 3600
      MessageRetentionPeriod: 300
      QueueName: sso-sendnotification.fifo

      RedriveAllowPolicy:
        Fn::ToJsonString:
          - redrivePermission: denyAll

      RedrivePolicy:
        Fn::ToJsonString:
          - deadLetterTargetArn: !GetAtt SQSSendNotificationsDeadLetterQueue.Arn
            maxReceiveCount: 3

      SqsManagedSseEnabled: true

  SQSSendNotificationsDeadLetterQueue:
    Type: AWS::SQS::Queue
    Properties:
      DeduplicationScope: messageGroup
      FifoQueue: true
      FifoThroughputLimit: perMessageGroupId
      KmsDataKeyReusePeriodSeconds: 86400
      MessageRetentionPeriod: 1209600
      QueueName: sso-sendnotification-dl.fifo
      RedriveAllowPolicy:
        Fn::ToJsonString:
          - redrivePermission: byQueue
            sourceQueueArns: !GetAtt SQSSendNotifications.Arn

I know that there is a clear "circular-reference" in the queue and DL-queue seciton. But here is what I want to ask: From the logic standpoint:

• SQSSendNotifications "denyAll" queue from using this queue as DL
• SQSSendNotifications will redirect all failed messages to SQSSendNotificationsDeadLetterQueue.Arn

While

• SQSSendNotificationsDeadLetterQueue only accept (i.e. byQueue) this queue as source queue: SQSSendNotifications.Arn
• There is no RedrivePolicy as this is a DL queue.

If the logic above is correct, why would there be a "circular reference" and throw error? These two different sections referring each other, which is normal and correct.

Can anyone please help explain it to me?

Thank you very much.