Missing bundle for entity type node after upgrading

I recently upgraded a local sandbox to Drupal core 9.2.4. While testing things out, I got an error when trying to add a new article content from /node/add/article.

The log shows the following message.

DrupalCoreEntityEntityStorageException: Missing bundle for entity type node in DrupalCoreEntityContentEntityStorageBase->doCreate() (line 97 of /var/www/drupal9sandbox/docroot/core/lib/Drupal/Core/Entity/ContentEntityStorageBase.php).

The only change I made prior to this is that in the article.routing.yml file. I had to use _entity_form: 'node.default' in lieu of DrupalnodeControllerNodeController::add() as that is deprecated in Drupal 9, as reported in NodeController::add() method is deprecated.

This is the complete content of the articles.routing.yml file.

Apart from the small change to _entity_form: 'node.default', I did not touch anything else.

custom_articles.add_content:
  path: '/node/add/article'
  defaults:
    _entity_form: 'node.default'
    _title_callback: 'DrupalnodeControllerNodeController::addPageTitle'
    node_type: 'article'
  requirements:
    _node_add_access: 'node:article'
  options:
    _node_operation_route: TRUE
    parameters:
      node_type:
        with_config_overrides: TRUE

I am not sure where the bundle type would be defined, but this content type was working well on Drupal 8.9.16.

This article was republished from its original source.
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Missing bundle for entity type node after upgrading

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