U can fix this bug by:
[
{ "keys": ["ctrl+keypad_divide"], "command": "toggle_comment", "args": { "block": false } },
{ "keys": ["ctrl+shift+keypad_divide"], "command": "toggle_comment", "args": { "block": true } },
]
it allow to comment with CTRL+/ and CTRL+SHIFT+/
and u can use / on keypad =)