ORA-42016 when executing DBMS_REDEFINITION.START_REDEF_TABLE from script

Question

A well-known task: convert BASICFILE LOBs to SECUREFILE LOBs.

I have a table:

    CREATE TABLE "DKR"."DKR_SEARCH_INFO"
   (    "ID" NUMBER NOT NULL ENABLE,
    "REPORT" BLOB,
    "CREATE_TS" TIMESTAMP (6),
    "OWNER" VARCHAR2(45),
     CONSTRAINT "DKR_SEARCH_INFO$PK$"
PRIMARY KEY ("ID")
  USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS  ENABLE
   ) SEGMENT CREATION IMMEDIATE
  PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255
 NOCOMPRESS LOGGING
 LOB ("REPORT") STORE AS SECUREFILE (COMPRESS MEDIUM DEDUPLICATE)  --
  --
 TABLESPACE WSDATA;

After that I generate interim table DDL with SECUREFILE (from DBMS_METADATA.GET_DDL procedure):

    CREATE TABLE "DKR"."DKR_SEARCH_INFO_1"
   (    "ID" NUMBER NOT NULL ENABLE,
    "REPORT" BLOB,
    "CREATE_TS" TIMESTAMP (6),
    "OWNER" VARCHAR2(45),
     CONSTRAINT "DKR_SEARCH_INFO$PK$_1"
PRIMARY KEY ("ID")
  USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS  ENABLE
   ) SEGMENT CREATION IMMEDIATE
  PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255
 NOCOMPRESS LOGGING
 LOB ("REPORT") STORE AS SECUREFILE (COMPRESS MEDIUM DEDUPLICATE)  --
  --
 TABLESPACE WSDATA;

After that I execute script with START_REDEF_TABLE procedure:

    SET serveroutput ON;
BEGIN
    FOR redef_table IN
    (SELECT DISTINCT dtc.owner, dtc.table_name, (LISTAGG(dtc.column_name || ' ' || dtc.column_name, ',') WITHIN GROUP (ORDER BY dtc.column_id)) AS COL_MAP
    FROM dba_tab_columns dtc, dba_lobs dl
    WHERE dtc.owner = dl.owner AND dtc.table_name = dl.table_name
    AND dl.owner NOT IN ('APEX_030200', 'CTXSYS', 'EXFSYS', 'FLOWS_FILES', 'MDSYS', 'OLAPSYS', 'ORDDATA', 'OUTLN', 'SYS', 'SYSMAN', 'SYSTEM', 'WMSYS', 'XDB')
    AND dl.partitioned = 'NO' AND dl.securefile = 'NO' AND dl.segment_created = 'YES' AND dtc.table_name = 'DKR_SEARCH_INFO'
    GROUP BY dtc.owner, dtc.table_name
    ORDER BY dtc.owner, dtc.table_name)
    LOOP
    BEGIN    
      DECLARE
        l_col_map VARCHAR2(4000);
          BEGIN
            l_col_map := redef_table.col_map;
            DBMS_OUTPUT.PUT_LINE(redef_table.col_map);
            DBMS_OUTPUT.PUT_LINE('Owner: ' || redef_table.owner);
            DBMS_OUTPUT.PUT_LINE('Table orig: ' || redef_table.table_name);
            DBMS_OUTPUT.PUT_LINE('Table interim: ' || redef_table.table_name || '_1');
            DBMS_OUTPUT.PUT_LINE(l_col_map);
            DBMS_REDEFINITION.START_REDEF_TABLE(redef_table.owner, redef_table.table_name, redef_table.table_name || '_1', '''' || l_col_map || '''');
          END;
    END;
                --DBMS_OUTPUT.PUT_LINE(redef_table.col_map);
    END LOOP;
  END;
/

And I receive error:

    Error starting at line : 4 in command -

Error report -
ORA-42016: shape of interim table does not match specified column mapping
ORA-06512: на  "SYS.DBMS_REDEFINITION", line 56
ORA-06512: на  "SYS.DBMS_REDEFINITION", line 1498
ORA-06512: на  line 21
42016. 0000 -  "shape of interim table does not match specified column mapping"
*Cause:    The number of columns, or the type or the length semantics of a
           column, in the interim table did not match the specified
           column mapping.
*Action:   Ensure that the interim table matches the column mapping by
           either modifying the column mapping string or altering the
           interim table's column definition(s).
ID ID,REPORT REPORT,CREATE_TS CREATE_TS,OWNER OWNER
Owner: DKR
Table orig: DKR_SEARCH_INFO
Table interim: DKR_SEARCH_INFO_1
ID ID,REPORT REPORT,CREATE_TS CREATE_TS,OWNER OWNER

When I execute this command not from the script, everything is ok:

        DECLARE 
       l_col_map VARCHAR2(4000); 
    BEGIN 
    -- map all the columns in the interim table to the original table 
       l_col_map := 'ID ID,REPORT REPORT,CREATE_TS CREATE_TS,OWNER OWNER'; 
       DBMS_REDEFINITION.START_REDEF_TABLE('DKR', 'DKR_SEARCH_INFO_1', 'DKR_SEARCH_INFO_1', l_col_map); 
    END; 
    /

anonymous block completed

I do not understand where I made a mistake in script.. All commands executed under SYS user.