Please include version information.
I have run into the same issue on 18c.
There is no mention of this error in My Oracle Support.
I'm working with Oracle 19c.
when you uninstall your application in your application root, Oracle creates a clone of your application root because there may be application PDBs which are using the application.
Okay, but just like the PDBs are synchronized to update to a new version, it should be able to be synchronized to be deleted. Until when the cloning is maintained?