SQL Developer for VS Code

1. I created a package in the database, and then saved the specification and body as files on disk.
2. I dropped a package from the database
3. I opened spec and body from local files created at 1
4. run debug
5. compile for debug
6. ERROR

package pkg_test.pks

create or replace package pkg_test is
    procedure main;
end;

package body pkg_test.pkb

create or replace package body pkg_test is

procedure main is
begin
    for i in 1..10 loop
       dbms_output.put_line(i);
    end loop;
end;
end;

I'm not sure if it is a bug or I did sth wrong but I definitely need help here :)