Change record status: 
Project: 
Introduced in branch: 
9.1.x
Introduced in version: 
9.0.0-alpha2
Description: 

As part of adding a base class for reference fields, the Drupal 6 NodeReference field plugin was moved to a d6 subdirectory.

Any classes extending \Drupal\migrate_drupal\Plugin\migrate\field\NodeReference should be updated to extend \Drupal\migrate_drupal\Plugin\migrate\field\d6\NodeReference.

Impacts: 
Module developers