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ContentPlaceHolder SPNavigation missing from PubCollab and Publishing master pages
A placeholder with ID "SPNavigation" is missing from "Starter PubCollab.master" and "Starter Publishing.master". This breaks some out-of-the-box SharePoint pages, for instance the Metadata Navigation settings page on document
libraries (found at /_layouts/15/MetaNavSettings.aspx).
Issue could be fixed by adding <asp:ContentPlaceHolder ID="SPNavigation" Visible="False" runat="server" /> to the master pages.