Rails ActiveAdmin routing problem at index page with renamed resource

Question

I have an index page:

ActiveAdmin.register Activity do
  config.sort_order = ''
  belongs_to :specialist, optional: true
  belongs_to :activities_category, optional: true
end

And I have another index page for the same but renamed resource:

ActiveAdmin.register Activity, as: 'ModeratedActivity' do
  config.sort_order = 'updated_at_asc'
  actions :index, :show
  belongs_to :specialist, optional: true
  belongs_to :activities_category, optional: true
  ...
end

These pages have totally different index tables, filters and permissions.

The problem is that id_colunm, index actions and filters form of ModeratedActivity page route to Activity page actions.

For example: filters form on ModeratedActivity page should route to:

/admin/moderated_activities?[filter_params]

But actually route to:

/admin/activities?[filter_params]

Tried to change controller defaults on ModeratedActivity page:

controller do
  defaults :route_collection_name => "moderated_activities", route_instance_name: "moderated_activity", :collection_name => 'moderated_activities', :instance_name => 'moderated_activity', :resource_class => Activity
  ...
end

Didn't help.