INITIALIZE creating zeros

196: INITIALIZE group entry with OCCURS

     1  
     2         IDENTIFICATION   DIVISION.
     3         PROGRAM-ID.      prog.
     4         DATA             DIVISION.
     5         WORKING-STORAGE  SECTION.
     6         01 G1.
     7           02 G2          OCCURS 2.
     8             03 X1        PIC X.
     9             03 X2        PIC 9.
    10         PROCEDURE        DIVISION.
    11             MOVE SPACE TO G1.
    12             INITIALIZE G2 (2).
    13             IF G1 NOT = "   0"
    14        *>      DISPLAY G1 NO ADVANCING
    15        *> also applied in tests below
    16        *>
    17                DISPLAY G1
    18                END-DISPLAY
    19             END-IF.
    20             STOP RUN.

Output is 0, but the default value of G1 has no 0.