Header 3 and 4 icons not being displayed in 2.0.0

[dinukapj]

Originally posted here: #2206 and #3141 and it was mentioned that the fix is included in 2.0.0

Still happens in 2.0.0.

Markup:

<link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/quill.snow.css" rel="stylesheet" />
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/quill.js"></script>
...
 <script>
     const toolbarOptions = [
         ['bold', 'italic', 'underline', 'strike'],
         ['blockquote', 'code-block'],
         ['link', 'image'],

         [{ 'header': 1 }, { 'header': 2 }, { 'header': 3 }, { 'header': 4 }],
         [{ 'list': 'ordered' }, { 'list': 'bullet' }, { 'list': 'check' }],
         [{ 'script': 'sub' }, { 'script': 'super' }]
     ];

     const quill = new Quill('#editor', {
         modules: {
             toolbar: toolbarOptions
         },
         placeholder: 'Compose module content',
         theme: 'snow'
     });
 </script>