"Unable to resolve column" for package level variables in PLSQL

Steps to reproduce:
1. create an sql file:

CREATE OR REPLACE PACKAGE test05 AS
    TYPE test_record IS RECORD
        (
            col1    NVARCHAR2(1024)
        );

    type t_resulting_record_type is table of test_record;

    t_1 t_resulting_record_type;

    procedure p1;
END;
/

CREATE OR REPLACE PACKAGE BODY test05 AS
    procedure p1 as
        l_row test_record;
        l_sql1 varchar(4096);
    begin
        l_sql1:='select ''a'' from dual';
        execute immediate l_sql1 bulk collect into t_1;

        for l_i in 1..t_1.COUNT loop
                l_row :=t_1(l_i);
                dbms_output.put_line(l_row.COL1);
        end loop;
    END p1;
end;
/

2. Compile using ctrl+Enter
3. Refresh using ctrl-f5
4. Observe that COUNT has error "unable to resolve column"