Is there a limit imposed to fetch a maximum of three citations for any publications? On repeated triggers via UI or drush no new citations are added to the publications.

For example, open citations own example with DOI 10.1186/1756-8722-6-59 has 66 citations, but the module only fetches the following three

10.1016/j.biopha.2017.01.070Receptor Tyrosine Kinase-Like Orphan Receptor 1 (Ror-1): An Emerging Target For Diagnosis And Therapy Of Chronic Lymphocytic Leukemia
10.1016/j.bmcl.2015.01.032Potent And Selective Bruton’S Tyrosine Kinase Inhibitors: Discovery Of Gdc-0834
10.1016/j.bmc.2019.06.023Discovery And Biological Evaluation Of Pyrimido[4,5-D]Pyrimidine-2,4(1H,3H)-Dione Derivatives As Potent Bruton’S Tyrosine Kinase Inhibitors

When the trigger is used to update citations via the UI for a single publication or all publications or via drush it completes instantaneously. However, no citations are added to any publications.

Setup: Install module, generate 50 publications using the devel generate option.

The following logs are added to Drupal log
Error: Call to undefined method Drupal\open_citations\Commands\CitationsUpdateDrushCommand::t() in Drupal\open_citations\Commands\CitationsUpdateDrushCommand->updateCitations() (line 25 of /opt/drupal/web/modules/custom/open_citations/src/Commands/CitationsUpdateDrushCommand.php)

This issue can be temporarily avoided by removing the t() function. Running the update citation trigger again logs the following warning.

Warning: Undefined array key 50 in Drupal\open_citations\OpenCitationsBatches::operationCallback() (line 136 of /opt/drupal/web/modules/custom/open_citations/src/OpenCitationsBatches.php)

Seems like the batch processing is not be triggered.

PS: Great talk and module at Drupal Dev Days. Thanks for sharing.