I run two sites.
Both have the latest version of ACF pro installed and WordPress is the latest version 6.2.2.
On site A, a revision is recorded every time you change the contents of the custom field, but
On site B, changing the custom field is not recorded in the revision.
If you change fields other than ACF (title, body, etc.), revisions are accumulated from 2 to 3.
At that time, when you look at the first revision, all the contents registered in ACF are recorded.
In other words, the first time is recorded, but the second and subsequent revisions are not recorded.
Not sure if it’s related, but
Site A uses the standard WordPress post (post),
Site B supports this by adding a revision function to the custom post type.
If you know the cause, I would appreciate it if you could teach me.