title: WordPress has started warning me "Leave Site? Changes you made may not be saved" when no changes have been made
body: <p>In the WordPress theme my team has developed, we've recently run into an issue where no matter what, when trying to exit a Post/Page/Custom-Post-Type, WordPress will throw up the warning, &quot;Leave Site? Changes you made may not be saved.&quot; Even if you click update and then immediately try to exit the page, it will throw that warning.</p>
  <p><a href="https://i.stack.imgur.com/lynKj.png" rel="nofollow noreferrer">Leave Site Image</a></p>
  <p>I cannot figure out what is causing this. This behavior started when I pushed out a major update a couple of days ago. I tried completely removing that update, reverting all the changes via git, and the behavior persists. I even switch to a branch of the theme that hasn't been worked on in months, and the behavior persists.</p>
  <p>I've tried Chrome, Firefox, Edge, and the behavior persists. I've had coworkers try it on their computers s, and the behavior persists.</p>
  <p>It's driving me crazy! Does anyone have any advice even where to start looking? Is it just a recent WordPress issue and nothing to do with our Theme?</p>