After applying the June 2021 security update (KB 5001954), you will encounter the following issue with publishing sites: Sorry something when wrong. ULS: 06/12/2021 10:04:03.58        w3wp.exe (0x1C24)        0x11CC        SharePoint Foundation        General        8sl1        High DelegateControl: Exception thrown while adding control ‘Microsoft.SharePoint.Publishing.Navigation.PortalSiteMapDataSource’: System.MissingMethodException: Method not found: ‘Boolean Microsoft.SharePoint.Utilities.SPUtility.SafeForDataBinding(System.Reflection.Assembly, System.Reflection.Assembly, System.String)’. at Microsoft.SharePoint.Publishing.Navigation.PortalSiteMapDataSource.get_PortalProvider() at Microsoft.SharePoint.Publishing.Navigation.PortalSiteMapDataSource.OnInit(EventArgs e) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.AddedControl(Control control, Int32 index) […]