XF web upgrade exposes half-upgraded state to addons due to composer class-map

When upgrading from XF2.x => XF2.3, a new composer class map is deployed while the XF2.x application state is loaded in the "Verifying and copying files" step.

@TMC reported this error, where the class-map pointed to a file which doesn't exist yet:
Code:

Fatal error: Uncaught ErrorException: [E_WARNING] include(/var/www/[redacted]/public/src/vendor/composer/../../../src/vendor-patch/Doctrine/Common/Cache/CacheProvider.php): Failed to open stream: No such file or directory

Since the caching...

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