title: wp_nav_menu dont return proper values
body: <p>Im making custom wordpress theme based on underscore theme. I have problem with outputing my navigation parameters given in functions work not exacly like it is said in Wordpress documentation and im getting confused more and more.</p>
  
  <p>So first of here is my function:</p>
  
  <pre><code>  wp_nav_menu( array (
                  'theme_location' =&gt; 'mobile',
                  'container' =&gt; 'div',
                  'container_class' =&gt; 'test',
                  'menu_class' =&gt; 'collapse navbar-collapse',
                  'menu_id' =&gt; 'bs-example-navbar-collapse-1'
  
                  ));
  </code></pre>
  
  <p>Here is my HTML with this what i want to achieve :</p>
  
  <pre><code>  &lt;div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1"&gt;
                    &lt;ul class="nav navbar-nav"&gt;
                      &lt;li class="active"&gt;&lt;a href="#"&gt;Link &lt;span class="sr-only"&gt;(current)&lt;/span&gt;&lt;/a&gt;&lt;/li&gt;
                      &lt;li&gt;&lt;a href="#"&gt;Link&lt;/a&gt;&lt;/li&gt;
                      &lt;li&gt;&lt;a href="#"&gt;Link&lt;/a&gt;&lt;/li&gt;
                      &lt;li&gt;&lt;a href="#"&gt;Link&lt;/a&gt;&lt;/li&gt;
                    &lt;/ul&gt;
                  &lt;/div&gt;&lt;!-- /.navbar-collapse --&gt;
  </code></pre>
  
  <p>And here is what i recieve when i use function posted above</p>
  
  <pre><code>&lt;div id="bs-example-navbar-collapse-1" class="collapse navbar-collapse"&gt;&lt;ul&gt;&lt;li class="page_item page-item-2"&gt;&lt;a href="http://localhost/jlvwp/index.php/przykladowa-strona/"&gt;Przykładowa strona&lt;/a&gt;&lt;/li&gt;&lt;/ul&gt;&lt;/div&gt;
  </code></pre>
  
  <p>So this what i recieve its completly diffrent with this what is in <a href="https://developer.wordpress.org/reference/functions/wp_nav_menu/" rel="nofollow noreferrer">WordPress documentation</a>. First of <code>menu_id / menu_class</code> is suppose to add class/id to <code>ul</code> tag and instead its adding class/id to container. Secound <code>container_class</code> simply do not work and im unable to add class to my <code>&lt;ul&gt;</code> tag. I beg for help im more then confused.</p>