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As part of the CICD pipeline, a DevOps Engineer is performing a functional test using a CloudFormation template that will later get deployed to production. That CloudFormation template creates an S3 bucket and a Lambda function which transforms images uploaded into S3 into thumbnails. To test the Lambda function, a few images are automatically uploaded and the thumbnail output is expected from the Lambda function on the S3 bucket. As part of the clean-up of these functional tests, the CloudFormation stack is deleted, but right now the delete fails. What's the reason and how could this issue be fixed?