Portal liquid misbehaviour after 8.4 update

So, after 8.4.0.125 portal update, my customization on portal's header just stopped working.

I have a logic to check a custom field in each weblink on primary navigation

{% assign primary_nav = weblinks["Primary Navigation"] %}
      {% if primary_nav %}
        <div class="navbar-right menu-bar {% if primary_nav.editable %}xrm-entity xrm-editable-adx_weblinkset{% endif %}" data-weblinks-maxdepth="2">
          <ul class="nav navbar-nav weblinks">
            {% for link in primary_nav.weblinks %}
            
                {% if link.grv_target_customer.value == 0 %}
                    {% assign showLink = true | boolean %}

{% else %}

{% assign showLink = false| boolean %}

{% endif %}

.

.

.

grv_target_customer is a picklist and contains data on each weblink, but if i call a javascript to show me the 'link.grv_target_customer.value' it doen't display anything.

Again, in version 8.3 the code was working just fine and i didn't found any changelog about liquid on this update.

Can someone save me?