I have a series of ACF custom fields that are setup to show on the page edit screen if the page’s template is set to a certain template. When I create a new page, and go to the template dropdown to select my template, it makes my ACF fields appear in the edit screen. If I then add content to those fields and save the draft or ‘Publish’, I can refresh my edit screen and my content in my ACF fields doesn’t save. However, if I add the content again to the ACF custom fields, and save/update, the changes stick.
I tested a situation where I have an ACF custom field appear on the post type of ‘page’ and when I create a new page, add content to that custom field, save/publish and refresh, my custom field content is saved and isn’t lost like in my scenario described above.
I’ve disabled all plugins except ACF and it is still an issue. max_input_vars is set to 3000. ACF Pro and WP are both up to date