Django Jazzmin add button disappeared after adding mptt admin

I'm using jazzmin for django admin and mptt. After adding mptt to admin, in jazzmin theme add button disappeared. I'm using latest versions of all libraries

class CustomMPTTModelAdmin(MPTTModelAdmin):
    # specify pixel amount for this ModelAdmin only:
    mptt_level_indent = 30


admin.site.register(Menu, CustomMPTTModelAdmin)

Here you can see the admin where button disappeared

When I disable jazzmin or remove Mptt add button returns back on place

INSTALLED_APPS = [
    # 'jazzmin',
    .....
]

Here you can button returns back

There is also issue was opened on github https://github.com/farridav/django-jazzmin/issues/126

but I could not find solution for this problem

I was facing the exact same issue while using django-mptt and django-jazzmin together. It seems that the admin template admin/mptt-change-list.html currently does not have the {% change_list_object_tools %} tag present, which causes the Add button to not be rendered.

The solution is to override the mptt-change-list.html template with:

{% extends "admin/mptt_change_list.html" %}
{% load admin_list i18n mptt_admin %}

{% block result_list %}
  <div class="row">
    <div class="col-12 col-sm-8">
      {% if action_form and actions_on_top and cl.show_admin_actions %}{% admin_actions %}{% endif %}
    </div>
    <div class="col-12 col-sm-4">
      {% block object-tools %}
        {% block object-tools-items %}
          {% change_list_object_tools %}
        {% endblock %}
      {% endblock %}
    </div>
    <hr>
    <div class="col-12">
    {% mptt_result_list cl %}
    </div>
    {% if action_form and actions_on_bottom and cl.show_admin_actions %}
      <div class="row">
        <div class="col-12">
          {% admin_actions %}
        </div>
      </div>{% endif %}
  </div>
{% endblock %}