Preview changes is not working for Custom fields (created with ACF PRO) on CPT pages (created with CPT UI). In these cases any content changes not being included in preview changes.
I have disabled all other plugins (including purging W3 Total cache) and it is still occurring.
I see that someone else has posted the same issue in a 2 year old thread that was solved but thought it better to start a new one.
ACF Version: 5.6.10
WP Version: 4.9.5
Let me know what other information you may need to debug.
Solved. Enabling Revisions for the Custom post types solved this issue.
