New version of YAML does not allow duplicate values of key value pairs

[Yh010]

https://www.drupal.org/project/upgrade_status/issues/3256376#:~:text=Duplicate%20keys%20in%20YAML%20files,newer%20version%20throws%20an%20exception.

Please refer to this article.
thus the section of code for duplicate values of key-value pairs (in advanced data types file) should be removed.