Hi,
My error was happening on a custom post type created by a plugin called Charitable that allows for ACF fields on the page. I reached out to them about the JavaScript errors since they weren’t occurring on any other of my custom post types. They responded saying that it’s an issue related to a bug that happens with their Recurring Donations extension when it is not installed alongside their plugin.
So the solution for me was to install the extension and luckily that fixed everything.
Are you editing WordPress pages or pages from a plugin? If it is from a plugin, I would try contacting them.
Best of luck!
