diff --git a/app/assets/stylesheets/zammad.scss b/app/assets/stylesheets/zammad.scss
index beaf7868e..5b2fa1de9 100644
--- a/app/assets/stylesheets/zammad.scss
+++ b/app/assets/stylesheets/zammad.scss
@@ -7042,7 +7042,7 @@ footer {
 
 /* allow/show autocomplete in modal dialog */
 .ui-autocomplete.ui-widget-content {
-  @extend .zIndex-8;
+  @extend .zIndex-9;
   position: absolute;
   max-height: 380px;
   overflow: auto;
diff --git a/spec/system/manage/trigger_spec.rb b/spec/system/manage/trigger_spec.rb
new file mode 100644
index 000000000..4e3ca2e8b
--- /dev/null
+++ b/spec/system/manage/trigger_spec.rb
@@ -0,0 +1,28 @@
+require 'rails_helper'
+
+RSpec.describe 'Manage > Trigger', type: :system do
+
+  context 'Perform' do
+
+    context 'Tags' do
+
+      it 'shows tag selection list in foreground' do
+        tag_item = create :tag_item
+
+        visit '/#manage/trigger'
+        click '.page-header-meta .btn--success'
+
+        modal_ready
+
+        within '.modal .ticket_perform_action' do
+          find('.js-attributeSelector select').select('Tags')
+
+          input = find('.js-value .token-input')
+          input.fill_in with: tag_item.name.slice(0, 3)
+        end
+
+        expect(page).to have_css('.ui-autocomplete.ui-widget-content') { |elem| !elem.obscured? }
+      end
+    end
+  end
+end