Can't Hide Default Submit Button

In all my sites using the webform module, I usually hide the default submit button and instead add a custom one as a markup form component. To hide the default webform submit button, you just go to form settings > advanced settings, then change the submit button label to . That removes the default submit button from the form, and then you can add your own button in... It's worked perfectly for years on multiple sites of mine.

Suddenly yesterday it decided to stop working as expected. Instead it made the default submit button actually put as the label on the button itself. I thought it was a quirk with the older site I was adding it to, so I ignored it... but now today, it's doing it on a different site with an entirely different theme of our's...

What I'm trying to figure out is if this is because of an update to the webform module or something else. Both of these sites have the latest 7x release of the module.