I have a user that is an owner of a SharePoint Site that, when she clicks on the star to follow her site, she does not see the site in the Following section on the SharePoint.aspx page. I have activated the Following Content site feature and can confirm that two other users of the site can see this site in their Following area.
I have some user reporting that a site they follow is no longer showing in the following list or in the recent list. They also can't see the shared library from OneDrive. Nothing was changed by the user and it isn't affecting all sites. Were you able to solve this? I wonder if these issues are related.