This shouldn't ever appear on the index, we have a preview partial

app/views/cards/display/common/_assignees.html.erb

@@ -4,7 +4,7 @@
   <% end %>
 
   <div class="position-relative" data-controller="dialog" data-action="keydown.esc->dialog#close click@document->dialog#closeOnClickOutside" <%= "hidden" if card.closed? %>>
-    <button class="btn card__hide-on-index card__hide-on-public" data-action="click->dialog#open:stop" style="--btn-background: var(--card-bg-color);">
+    <button class="btn card__hide-on-index" data-action="click->dialog#open:stop" style="--btn-background: var(--card-bg-color);">
       <%= icon_tag "person-add" %>
       <span class="for-screen-reader">Assign</span>
     </button>