Cant set my xkb's xkeymap with xkbcomp

[aprekates]

$  setxkbmap -layout us,gr,de

$ setxkbmap -print
xkb_keymap {
     xkb_keycodes  { include "evdev+aliases(qwerty)"    };
     xkb_types     { include "complete"    };
     xkb_compat    { include "complete+ledscroll(group_lock)"    };
     xkb_symbols   { include 
"pc+us+gr:2+de:3+inet(evdev)+group(ctrl_shift_toggle)"};
     xkb_geometry  { include "hhk(basic)"    };

So setxkbmap does report current xkeymap .

And if i create an xkeymap dump and check it's symbols section:

$ xkbcomp -xkb $DISPLAY xkbmap.out

$ less xkbmap.out

xkb_symbols "pc+us+gr:2+de:3+inet(evdev)+group(ctrl_shift_toggle)" {

    name[group1]="English (US)";

     name[group2]="Greek";

     name[group3]="German";

   

     key  <ESC> {         [          Escape ] };

     key <AE01> {

         type[group2]= "FOUR_LEVEL",

         type[group3]= "FOUR_LEVEL",

         symbols[Group1]= [               1,          exclam ],

         symbols[Group2]= [               1,          exclam,        NoSymbol,     onesuperior ],

         symbols[Group3]= [               1,          exclam,     onesuperior,      exclamdown ]

     };

     key <AE02> {

         type[group2]= "FOUR_LEVEL",

         type[group3]= "FOUR_LEVEL",

         symbols[Group1]= [               2,              at ],

         symbols[Group2]= [               2,              at,         onehalf,     twosuperior ],

         symbols[Group3]= [               2,        quotedbl,     twosuperior,       oneeighth ]

     };

Now lets see what happens if i try to change xkeymap with loading a 
Kccgst description to xkbcomp:

$ less mapus

xkb_keymap {
         xkb_keycodes  { include "evdev+aliases(qwerty)" };
         xkb_types     { include "complete"      };
         xkb_compat    { include "complete+ledscroll(group_lock)"        };
         xkb_symbols   { include 
"pc+us+inet(evdev)+group(ctrl_shift_toggle)"    };
         xkb_geometry  { include "hhk(basic)"    };
};

$  xkbcomp mapus $DISPLAY

$ xkbcomp -xkb $DISPLAY xkbmap.out

$ less xkbmap.out

xkb_symbols "pc+us+inet(evdev)+group(ctrl_shift_toggle)" {

     name[group1]="English (US)";
     name[group2]="Greek";
     name[group3]="German";

     key  <ESC> {         [          Escape ] };
     key <AE01> {         [               1,          exclam ] };
     key <AE02> {         [               2,              at ] };
     key <AE03> {         [               3,      numbersign ] };
     key <AE04> {         [               4,          dollar ] };


$ setxkbmap -print                    // still shows us,gr,de !
xkb_keymap {
     xkb_keycodes  { include "evdev+aliases(qwerty)"    };
     xkb_types     { include "complete"    };
     xkb_compat    { include "complete+ledscroll(group_lock)"    };
     xkb_symbols   { include 
"pc+us+gr:2+de:3+inet(evdev)+group(ctrl_shift_toggle)"};
     xkb_geometry  { include "hhk(basic)"    };
};

So is this a bug?

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