This temporary error was reported by Marketing Land to affect the main Dashboard page for all a user's pages, as well as the dashboard pages for each individual Page. Fortunately only Google Page owners see the issue in the dashboard view.
A Google spokesperson confirmed to Marketing Land that “this is only an issue within the Dashboard view — it’s not impacting how other people see your page. It’s a known issue that the team is working to fix.” Soooo.... Don't worry. People still love you.