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When I try to migrate, the wrong migration plugins are used

I’m trying to migrate a Drupal 6 site to Drupal 9. The problem is that when I try to run the migration I get a lot of errors as if Drupal try to use the Drupal 7 migration plugins instead of the Drupal 6 migration plugins.

I get these messages.

Field discovery failed for Drupal core version 7.

TypeError: in_array(): Argument #2 ($haystack) must be of type array, string given en in_array() (líne 106 of /var/www/html/web/core/modules/node/src/Plugin/migrate/source/d7/NodeType.php)

How I can tell Drupal to use the Drupal 6 plugins for the migration?

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When I try to migrate, the wrong migration plugins are used

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