"Sorry, something went wrong" when you click "New Navigation Link" or use "Save site as template"
Consider the following scenario:
You create a Microsoft SharePoint Online site collection by using the Basic Search Center template.
In Site Settings, you click Top Link Bar and then click New Navigation Link. Or, you try to use the Save site as template option in Site Settings.
In this scenario, you receive the following error message:
Sorry, something went wrong. An unexpected error has occurred.
This is a known issue in SharePoint Online.
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