Dear Customer - Thanks for reaching out to us via AWS re:Post
A CloudFormation stack gets stuck in the UPDATE_COMPLETE_CLEANUP_IN_PROGRESS state when AWS CloudFormation is still in the process of removing old resources, or cannot remove those resources due to a dependency issue.
This has been conveyed in the Knowledge Center article, here https://aws.amazon.com/premiumsupport/knowledge-center/cloudformation-stack-cleanup-stuck/ I hope the above information was helpful
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