Terraforming Exported tf and tfstate files use the tag as the resource name

[simple-easy]

Terraforming export the aws resources will use the tag as the name of resource, but sometimes we may use same tag for several ec2 instances as they have the same purpose. This will be lead to resource repeated multiple times error.
I think this is a bug, because there is no rule or policy on aws to tell us that we can not use the same tag 'Name'.