get_renderedうまくいかないとき

calendar.html

<!-- BEGIN_MODULE Calendar_Month ctx="{{ym}}" -->
<div>
    <div>
        <!-- BEGIN_SetRendered id="stryear" -->{year}<!-- END_SetRendered -->
        <!-- BEGIN_SetRendered id="strmonth" -->{month}<!-- END_SetRendered -->
        <h3 class="acms-text-center"><a href="{monthUrl}">{month}月</a></h3>
        <ul class="acms-text-center acms-list-inline">
            <li><a href="{prevUrl}" class="acms-btn-flat" title="前月へ">«</a></li>
            <li><a href="{yearUrl}" class="acms-btn-flat" title="年間カレンダーへ">{year}</a></li>
            <li><a href="{nextUrl}" class="acms-btn-flat" title="次月へ">»</a></li>
        </ul>
    </div>
    <table class="acms-table acms-table-bordered">
    <thead>
        <tr class="acms-text-center">
            <!-- BEGIN weekLabel:loop -->
            <td >{label}</td>
            <!-- END weekLabel:loop -->
        </tr>
    </thead>
    <tbody>
        <!-- BEGIN week:loop -->
        <tr class="acms-text-center">
            <!-- BEGIN day:loop -->
            <!-- BEGIN spacer -->
            <td> </td>
            <!-- END spacer -->
            <!-- BEGIN none -->
            <td><a class="date-<!-- GET_Rendered id="stryear" -->-<!-- GET_Rendered id="strmonth" -->-{day}">{day}</a></td>
            <!-- END none -->
            <!-- BEGIN link -->
            <td><a class="date-<!-- GET_Rendered id="stryear" -->-<!-- GET_Rendered id="strmonth" -->-{day}">{day}</a></td>
            <!-- END link -->
            <!-- END day:loop -->
        </tr>
        <!-- END week:loop -->
    </tbody>
    </table>
</div>
<!-- END_MODULE Calendar_Month -->

index.html

@include("calendar.html", {"ym": "2018/11"})
@include("calendar.html", {"ym": "2018/12"})