Linking Products in Shipping emails not working

[GFW-webAdmin]

I would like to have the products listed in these emails link to their respective product pages.

Shipping confirmation

Shipping update

Out for delivery

Delivered

in the Order Confirmation emails,

<a href="{{ shop.url }}{{ line.url }}">{% assign line_title = line.product.title %}</a>

works just fine.

However, in all the other emails, only the shop url is linking.

<a href="{{ shop.url }}{{ line.url }}"><img src="{{ line.line_item | img_url: 'compact_cropped' }}" align="left" width="60" height="60" class="order-list__product-image"/></a>

<span class="order-list__item-title"><a href="{{ shop.url }}{{ line.url }}">{{ line_title }}&nbsp;&times;&nbsp;{{ line_display }}</a></span><br/>

here is all the code in that td cell:

<td class="order-list__product-description-cell">
          {% if line.line_item.product.title %}	
            {% assign line_title = line.line_item.product.title %}	
          {% else %}	
            {% assign line_title = line.line_item.title %}	
          {% endif %}

          {% if line.quantity < line.line_item.quantity %}
            {% capture line_display %} {{ line.quantity }} of {{ line.line_item.quantity }} {% endcapture %}
          {% else %}
            {% assign line_display = line.line_item.quantity  %}
          {% endif %}

          <span class="order-list__item-title"><a href="{{ shop.url }}{{ line.url }}">{{ line_title }}&nbsp;&times;&nbsp;{{ line_display }}</a></span><br/>

          {% if line.line_item.variant.title != 'Default Title' %}
            <span class="order-list__item-variant"><a href="{{ shop.url }}{{ line.url }}">{{ line.line_item.variant.title }}</a></span><br/>
          {% endif %}

          {% if line.line_item.selling_plan_allocation %}
            <span class="order-list__item-variant">{{ line.line_item.selling_plan_allocation.selling_plan.name }}</span><br/>
          {% endif %}

          {% if line.line_item.refunded_quantity > 0 %}
            <span class="order-list__item-refunded">Refunded</span>
          {% endif %}

          {% if line.line_item.discount_allocations %}
            {% for discount_allocation in line.line_item.discount_allocations %}
              {% if discount_allocation.discount_application.target_selection != 'all' %}
                <span class="order-list__item-discount-allocation">
                  <img src="{{ 'notifications/discounttag.png' | shopify_asset_url }}" width="18" height="18" class="discount-tag-icon" />
                  <span>
                    {{ discount_allocation.discount_application.title | upcase }}
                    (-{{ discount_allocation.amount | money }})
                  </span>
                </span>
              {% endif %}
            {% endfor %}
          {% endif %}
        </td>