Missing menu item extensions during upgrade to one version

I just upgraded; what happened? The process to upgrade Dynamics 365 Finance and Operations from older versions (7.2, 7.3, etc.) to One Version (10.0) can be a daunting task depending on the amount of overlayering of code that might have been done in previous versions.  That code needs to be converted to extensions.  But what happens if you have extensions in your previous version and you find out that those extensions are completely missing in your upgraded One Version release branch?  This happened... Read the full text.
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