Re: SharePoint Lists - Version History for list items not showing actual changes

Microsoft communicates all changes and a range for timing in the Message Center in M365's Administrative site. You're asking the wrong person about the logic for Microsoft's release schedules and how they update their roadmap site.

I'd suggest working with your tenant administrators to get "User Experience Success Manager" applied to your account. This will allow you to read messages in the Message Center as well as track some additional information regarding advisories and incidents affecting your tenant. You can also work with an administrator in your tenant to submit a support ticket about these issues - this can give you more insight whether it is a bug or behavior expected from the update.