Failed to delete default.mysql8.0: Default DBParameterGroup cannot be deleted: default.mysql8.0


I am trying to delete the default DB parameter group after deletion of AWS RDS MySQL database but is giving the following error

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Not sure why its not getting deleted.
Tried referencing this doc and it says it might be in invalid state but how do I validate that ?

Initial State When No RDS instances were created

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default.mysql8.0 is a default parameter group, and you can’t delete default groups. From your link:

You can’t delete a default DB parameter group

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