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Discussion for doc: Migrate to Drupal 9 on Pantheon

After creating clean Drupal 9 site, added contrib modules then custom modules, themes and profiles, No Errors. When exported DB with content from current D8 site, imported into new D9 site – get the "paramconverter.latest_revision’ error.
( InvalidArgumentException : No converter has been registered for paramconverter.latest_revision in Drupal\Core\ParamConverter\ParamConverterManager->getConverter() (line 39 of core/lib/Drupal/Core/ParamConverter/ParamConverterManager.php ).)

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Tagging some of our wonderful Technical Writers/Docs contributors here for visibility! :eyes: @joan @edwardangert @michalsen