I see it, it's a bug
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I am using SQL Developer 220.127.116.11 to connect to a 12c PDB.
If I try to describe a DBMS Package the result is empty.
Just curious - are you connecting as a common user or a local user?
I confirmed the problem even if connected as SYS as SYSDBA direclty to a PDB so, as Jeff said, that would definitely be a bug rather than a privilege problem.
Not directly related to your issue but just FYI - the multi-tenant architecture of Oracle 12c has new functionality in many areas and one of them is in the system views. If your users in previous versions accessed system views you may be interested in this thread that discusses a new 'wrinkle' regarding privileges.
I connected as a local user to the PDB.
I will take a look at the recommended thread. It might be helpful, when it comes to migration and the question why an application doesn't run as bevor.