Got a response from the Amazon support team:
To begin with I would like to inform you that this is a known issue by our CloudFormation service team, and they are already working on a fix for this issue. The issue is caused by updating stack-level tags(not resource level tags i.e., even without specifically having made changes to the resource) on “AWS::Events::EventBus” resource type. The current workaround is to not make any changes to the stack-level tags used by any stacks containing an “AWS::Events::EventBridge“ resource. This will result in this resource not being updated thus allowing you to resume with update of your stacks without facing this error.
Also, we were able to replicate the scenario at our end. We created a stack with an "AWS::Events::EventBus" resource with Resource Level Tags and no error was shown after multiple updates requested. However, when we tried to add Stack Level Tags, we encountered the same error you are facing. Hence, it is confirmed that the issue is with the "Stack level tags".
Unfortunately, I’m not able to provide ETA on when this issue might be fixed since AWS Support Engineers are not privy to development road-maps. I would like to apologize for the inconvenience caused.
Rest assured, I will keep the case in Pending Amazon Action and I will keep you updated on the resolution of this issue as soon as I have an update from the internal Team.
By specifying stack failure options, you can troubleshoot resources in a CREATE_FAILED or UPDATE_FAILED status. You can provision failure options for all stack deployments and change set operations. Is it possible to view the stack events to see any associated error messages with the aws cloudformation describe-stack-events command.
To roll back a stack from the CREATE_FAILED or UPDATE_FAILED stack status Specify the rollback-stack operation to roll back a stack to its last stable state. Initiate a rollback with the rollback-stack operation and specify the stack name.
aws cloudformation rollback-stack --stack-name myteststack
Hope this helps !!
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