opnsense_widget_manager.js?v=05956ed8e4fd9d55:573 Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'getWidgetConfig') at opnsense_widget_manager.js?v=05956ed8e4fd9d55:573:66 at Array.map (<anonymous>) at WidgetManager._saveDashboard (opnsense_widget_manager.js?v=05956ed8e4fd9d55:572:41) at HTMLButtonElement.<anonymous> (opnsense_widget_manager.js?v=05956ed8e4fd9d55:290:24) at HTMLButtonElement.dispatch (jquery-3.5.1.min.js?v=05956ed8e4fd9d55:2:43090) at HTMLButtonElement.<anonymous> (jquery-3.5.1.min.js?v=05956ed8e4fd9d55:2:41074)
Well if it works on incognito browser windows, then you probably have some helpful extension installed that's breaking it on non-incognito ones.
(After a couple of try I figured out that there can be problem with the adblock origin too. After disabling and saving the dashboard the save work after reenabling the adblock.)