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

Change the List's view back to classic experience, here is the guide how to do that
https://support.microsoft.com/en-us/office/switch-the-default-experience-for-lists-and-libraries-from-new-or-classic-66dac24b-4177-4775-bf50-3d267318caa9

It will give you the old view back (with the version entries fully populated), when to switch back to new\modern dunno? Great thing here you can apply it to just the list and leave the site modern

Hope this helps