Oracle throws "ORA-21700: object does not exist or is marked for delete" when referencing a type declared inside a package, externally.

01PackageHeader.sql

-- This is the top few lines of my package header, showing the type declarations.

create or replace package aims_migration as 
  
  type r_aims_wo_item is record(ref_identifier varchar(50), geometry sdo_geometry);
  type t_aims_wo_item is table of r_aims_wo_item;

-- Rest of the package spec...

end aims_migration

02TestProcBad.sql

-- This is a procedure from my testing package.
-- This throws the ORA-21700 error.

  procedure ut_populate_wo_item as
    ids_to_migrate aims_migration.t_aims_wo_item;
    data_table varchar2(40);
    imported_identifier wo_item.ref_identifier%type;
  begin
    data_table := 'MAPINFO.FS_POLE';
    ids_to_migrate := aims_migration.get_records_for_import(data_table);
    aims_migration.populate_wo_item(99, data_table, ids_to_migrate); -- Passing ids_to_migrate back in here wrecks the show.
    select ref_identifier into imported_identifier from wo_item;
    utassert.eq('Standard Success Case', imported_identifier, 'P_GTLT02080_20110430_151722');
  end ut_populate_wo_item;

03TypeDefinitions.sql

-- We need to declare the types externally to the package.
-- This is just done from the SQL prompt, or a script.

-- Note: If I was re-creating these, I would not be able to mod r_aims_wo_item because the t_aims_wo_item is based on it.
-- I would have to drop t_aims_wo_item first.
create or replace type r_aims_wo_item is object(ref_identifier varchar(50), geometry sdo_geometry);
create or replace type t_aims_wo_item is table of r_aims_wo_item;

04TestProcGood.sql

-- The type used is now the globally declared one.
-- The types are removed altogether from the package header in the first file.

  procedure ut_populate_wo_item as
    ids_to_migrate fmc3.t_aims_wo_item;
    -- Rest of the declarations...
  begin
    -- Same body as above...
  end ut_populate_wo_item;