Invalid HTML, duplicate IDs

Problem/Motivation

First want to state... I came across an issue I'm trying to debug on, where, when I place a FullCalendar view on a page with views_embed_view($view, $display), the events are printing on the page twice. At first, I started to think I was seeing two containers in the HTML with the same ID, and maybe that was related, but I'm not sure that's related...
So when I place the calendar on the page, I am seeing that output HTML contains two divs with the same IDs, like:

<div class="views-element-container contextual-region">
  <div  class="contextual-region js-view-dom-id-09cd3014f0f58f8f4cbe9c3ac3aef8cbe6ee51a3b48b36a381816941fbbede91">
    <div id="js-view-dom-id-09cd3014f0f58f8f4cbe9c3ac3aef8cbe6ee51a3b48b36a381816941fbbede91" class="fullcalendar--wrapper">  <!-- ***** <<< ****** HERE ****** -->
      <div >
        <div id="js-view-dom-id-09cd3014f0f58f8f4cbe9c3ac3aef8cbe6ee51a3b48b36a381816941fbbede91" class="fullcalendar--wrapper"></div><!-- ***** <<< ****** AND HERE ****** -->
      <div id="fc-message"></div>
    </div>
  </div>
  <div id="fc-message"></div>
</div>

Steps to reproduce

1. Place a fullcalendar on a page.
2. View the source, or run the page through a validator like https://validator.w3.org/.

Proposed resolution

Not 100% sure I follow how this works... but ultimately, the `views-view--fullcalendar.html.twig` file, when it prints the {{ rows }} variable, it's re-printing the entire VIEW again. I'm actually not sure I understand what's happening here, or how it's not recursive (infinite).

Remaining tasks

Fix it?

User interface changes

??

API changes

??

Data model changes

??