only grouped in a single month

问题

I have grouped to get the ID together per month but only one month appears that is November and I have months like December and January added as a movement in those accounts and are included in November, someone knows the reason or how I could solve that it also appears the months that there are movements?

image of how I am currently seen: enter link description here

code:

    <record id="proyecto_rc.cuenta_view_search" model="ir.ui.view">
    <field name="name">proyecto_rc.account.search </field>
    <field name="model">proyecto_rc.account</field>
    <field name="arch" type="xml">
    <search string="String...">
        <field name="date"/>
        <group expand="1" string="Group By">
                <filter string="Month" name="month" help="help"  context="{'group_by':'date:month'}"/>
        </group>
    </search>
    </field>
    </record>

来源：https://stackoverflow.com/questions/59219548/only-grouped-in-a-single-month