Where am I loading jquery_ujs in my Rails 6 app?

Question

Bugsnag is reporting this error on many pages: "If you load both jquery_ujs and rails-ujs, use rails-ujs only"

Rails 6.1.3, with webpacker.

application.js:

//
//= require rails-ujs
//= require activestorage
//= require turbolinks
//= require_tree .

_head.html.erb:

<script src="https://code.jquery.com/jquery-3.5.1.min.js" integrity="sha256-9/aliU8dGd2tb6OSsuzixeV4y/faTqgFtohetphbbj0=" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js" integrity="sha384-OgVRvuATP1z7JjHLkuOU7Xw704+h835Lr+6QL9UvYjZE3Ipu6Tp75j7Bh/kR0JKI" crossorigin="anonymous"></script>

<script type="module" src="https://unpkg.com/[email protected]/dist/ionicons/ionicons.esm.js"></script>
<script nomodule="" src="https://unpkg.com/[email protected]/dist/ionicons/ionicons.js"></script>

<script src="//d2wy8f7a9ursnm.cloudfront.net/v7/bugsnag.min.js"></script>

<script>
  <% if current_user.blank? %>
    var currentUser = null;

    Bugsnag.start(
    { 
      apiKey: '<%= BUGSNAG_API_KEY %>', 
      releaseStage: '<%= Rails.env %>'
    });

  <% else %>
    var currentUser = { email: '<%= current_user.email %>' };

    Bugsnag.start(
    { 
      apiKey: '<%= BUGSNAG_API_KEY %>', 
      releaseStage: '<%= Rails.env %>',
      user: { email: '<%= current_user.email %>' }
    });
  <% end %>
</script>


<script src="https://js.stripe.com/v3/"></script>

<%= javascript_include_tag 'application', 'data-turbolinks-track' => 'reload' %>

I've looked but cannot find jQuery UJS in my code. So why am I getting this error? And how could I remove it? I can't reproduce it, and cannot tell if this is breaking the UX or is a warning.

Thanks.