SECTIONS don't work with PERFORM THRU

[jfletaso]

In this cobol program example:

       PROCEDURE DIVISION.
       
       DISPLAY 'Procedure division'.
       PERFORM FIRST-PARAGRAPH.
       PERFORM FIRST-PARAGRAPH THRU FIFTH-PARAGRAPH.
       PERFORM A0000-FIRST-SEC.
       PERFORM A0000-FIRST-SEC THRU A2000-THIRD-SEC.
       STOP RUN.

       FIRST-PARAGRAPH.
                DISPLAY '1st Paragraph'.
           
       SECOND-PARAGRAPH.
                DISPLAY '2nd Paragraph'.

       A0000-FIRST-SEC SECTION.
                DISPLAY 'A0000 Section'.
       
       THIRD-PARAGRAPH.
       		DISPLAY '3rd Paragraph'.
       		
       A1000-SECOND-SEC SECTION.
                DISPLAY 'A1000 Section'.
       
       FOURTH-PARAGRAPH.
       		DISPLAY '4th Paragraph'.
       		
       A2000-THIRD-SEC SECTION.
	        DISPLAY 'A2000 Section'.
       
       FIFTH-PARAGRAPH.
       		DISPLAY '5th Paragraph'.

In the "PERFORM FIRST-PARAGRAPH THRU FIFTH-PARAGRAPH." sentence, the SECTIONs (A0000-FIRST-SEC, A1000-SECOND-SEC, A2000-THIRD-SEC) are not processed by the parser.

Also, in the "PERFORM A0000-FIRST-SEC THRU A2000-THIRD-SEC." sentence, intermediate section "A1000-SECOND-SEC SECTION" is not processed.

Thank you.