Uncaught TypeError when hovering over logo in collapsed mode

I could not reproduce the error, but I also don't see any error or unexpected behavior with the patch applied.

You need to add a logo. The default logo uses different markup that does not cause a TypeError. Another potential solution is to wrap the <img> tag with a <span> tag. Addressing the issue in JavaScript ensures this problem won't occur with other toolbar items that may not follow the exact Gin structure.

See navigation--gin.html.twig:

{% if icon_path %}
  <a class="toolbar-link" href="{{ path('<front>') }}">
    <img alt="{{ 'Home'|t }}" src="{{ file_url(icon_path) }}" loading="eager" />
  </a>
{% else %}
  <a href="{{ path('<front>') }}" class="toolbar-link toolbar-link--has-icon toolbar-link--gin-home">
    <span>{{ 'Home'|t }}</span>
  </a>
  {% endif %}