Missing basic fields from biblio reference node

I have just migrated 2500+ references from D7 Biblio to D10 Bibcite and uid is 0 for all of them.
If we change the yml file (uid: node_uid), we should also add something in the source plugin Reference.php?
Thanks for any tip here, migrate from Biblio is critical now that D7 EOL is close.

I can't get uid from D7 node table.
I have tried this :

bibcite_migrate_bibliography.yml

id: bibcite_migrate_reference
label: Reference
migration_tags:
  - Drupal 6
  - Drupal 7
source:
  plugin: bibcite_reference
destination:
  plugin: entity:bibcite_reference
process:
  # Adtitional fields:
  # biblio_full_text
  # biblio_coins
  # biblio_md5
  # biblio_formats
  # biblio_sort_title
  title: title
  uid: uid
  created: created
  changed: changed
  bibcite_year:...

Reference.php

 public function query() {
    $query = $this->select('biblio', 'b');
    $query->join('node', 'n', 'b.vid = n.vid');
    $query->distinct();

    $query->fields('b');
    $query->fields('n',['uid','title','created','changed']);

    return $query;
  }
 /**
   * {@inheritdoc}
   */
  public function fields() {
    $fields = [
      'nid' => $this->t('Node ID'),
      'vid' => $this->t('Revision ID'),
      'uid' => $this->t('User ID (Author)'),
      'created' => $this->t('Created date'),
      'changed' => $this->t('Changed date'),
      'biblio_type' => $this->t('Type'),
      'biblio_number' => $this->t('Number'),
.....