Context
Sometimes entities created in a reference field get an incorrect ID.
Example: This term has (48) in the title:
https://contrib.drupalarchitect.info/drupal/development-48
This might be related to using Popular Tags, or this patch for referencing entities with parenthesis in the title.
This issue mentions the combination: https://www.drupal.org/project/drupal/issues/2924783#comment-14893268
The last comment has an explanation of the bug: https://www.drupal.org/project/drupal/issues/2924783#comment-16278176
Reproduction
With patch #46 in #2924783, referencing an entity with ID 48 is creating a new entity with (48) in the title.
Drupal Architect: https://www.drupalarchitect.info/tags/search-48
Contrib: https://contrib.drupalarchitect.info/drupal/development-48
Resolution
New patch should fix issues with handling ID numbers.
List all taxonomy terms to find parenthesis:drush sqlq "select tid, name from taxonomy_term_field_data where name like '%(%' order by name"
List all node titles with parenthesis:drush sqlq "select nid, title from node_field_data where title like '%(%' order by title"
TODO
Point duplicate references back to original, delete duplicate.