Your LimeSurvey version: 6.15.16
Own server or LimeSurvey hosting: Lime survey Hosting
Survey theme/template: Fruity

Hi there,I’ve built quite a complex survey in LimeSurvey. It’s multilingual and restricted to a specific group of participants. For some conditional questions, I use attributes from the participant table (e.g., ) so the survey doesn’t need to ask for information I already have.The issue is that when I start the survey and switch languages using the top-menu language switcher, the attribute information disappears. Apparently this happens because the URL changes from one that includes the token (e.g.: xxxxxx.limequery.org/376147?token=fuab_202500000a&newtest=Y ) to a generic URL without it ( xxxxxx.limequery.org/376147 ) .I got some JavaScript from an AI chat that was supposed to fix the problem, but it doesn’t. The code is intended to be placed in  .{# Capture all current query parameters #}
{% set q = app.request.query.all %}

{# (Optional) list of parameters you want to explicitly preserve #}
{% set keep = %}

{# When rendering each language option #}
<ul class="dropdown-menu languagechanger">
  {% for langcode, langname in aSurveyInfo.aOtherLanguages %}
    {# Merge current query parameters with the new 'lang' value #}
    {% set q2 = q|merge({'lang': langcode}) %}
    <li>
      <a class="ls-language-link"
         href="{{ app.request.pathInfo }}?{{ q2|url_encode('query') }}">
         {{ langname }}
      </a>
    </li>
  {% endfor %}
</ul>

How can I prevent the problem?
Is in the snippet any mistake?

Thanks!!