I ran into this problem. After trying to restore the database via SSMS using .bacpac, it fails and leaves you with a database in which you do not have delete rights.
A workaround is to use the rdsadmin rename function to rename it to something else, which seems to fix the resolution problem and allow you to abandon it.
EXEC rdsadmin.dbo.rds_modify_db_name N'<OldName>', N'<NewName>'
Then just drop the database. Hope that helps someone else in the same predicament.
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