AWS::SecretsManager::RotationSchedule doesn't check for existing schedule

I was able to add a SecretsManager rotation schedule resource to two different stacks for the same secret. When I removed the duplicate resource from one one of the stacks it deleted the schedule from the secret.

1. This seems like a bug in Cloudformation/Secrets Manager. I'd expect them to prevent creating the same resource in two different stacks.
2. Any advice on getting the schedule back in sync with the remaining stack resource?