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A critical vulnerability was discovered in React Server Components (Next.js). Our systems remain protected but we advise to update packages to newest version. Learn More.
Sounds like you either have a version mismatch somehow (between the UI files and the assembly versions loaded), or you have a customized admingroup.aspx which isn't working correctly.
Did anybody have this issue? There is no GroupList_DeleteCommand methods in the EPIServer.UI.Admin.AdminGroup?