A little more info…
The page where I have these two tinymce editor fields has several ACF fields on it of various types (the theme settings page for my theme).
And I noticed that if I load the page it won’t work initially. But if I click the “Text” tab and then the “Visual” tab (which does nothing for either) and then refresh the page, that it then ends up working. However, if I refresh the page again, it is the same issue with it not working again (and I need to follow those same steps again and refresh the page).
Very strange.
