Decoration tag - AEM Grid Class missing for mobile view

When we create a component using Touch UI, it is wrapped by a decoration tag which consists of AEM Grid classes like aem-GridColumn--tablet--12, aem-GridColumn--phone--8, aem-GridColumn--default--8 as below:

Decoration tag:

<div class="title-component aem-GridColumn--tablet--12 aem-GridColumn--phone--8 aem-GridColumn aem-GridColumn--default--8">

     Title Component HTML

</div>

But there is one class missing on this decoration tag for mobile view i.e. aem-GridColumn--phone--12

due to which it is taking width: 66.6% as below:

.aem-Grid.aem-Grid--phone--12 > .aem-GridColumn.aem-GridColumn--phone--8 {

    float: left;

    clear: none;

    width: 66.66666667%;

  }

If aem-GridColumn--phone--12 class was available, then it would have taken full width like:

.aem-Grid.aem-Grid--phone--12 > .aem-GridColumn.aem-GridColumn--phone--12 {

    float: left;

    clear: none;

    width: 100%;

  }

Is anyone facing this same issue?