Steps to reproduce the issue

1. Create a new post and click Save
   Click on Versions
   There should be at least one version of the post

2. Create a few custom fields
   Reopen the post, enter or change some field values, and save the post
   Click on Versions
   No new version of the post has been saved

3. Change something in the Content tab and save the post
   Click on Versions
   A new version of the post has been saved.

4. Change something in the Content tab and in the custom fields and save the post
   Click on Versions
   A new version of the post has been saved

Expected result

If only values in custom fields are changed, a new version should be saved.

Actual result

No new version will be saved.

System information (as much as possible)

6.0.0-rc1, PHP 8.4

Additional comments