https://www.drupal.org/project/smart_date/issues/3174274
Smartdate does not work on Custom Entities [#3174274] | Drupal.org
Oct 22, 2020 - Seems to be the exact same issue as the issue against version 2 of the module but it's happening again in 3.
does not workcustom entitiesdrupal
https://www.wolfram.com/language/11/knowledgebase-expansion/access-and-manipulate-curated-custom-entities.html
Access and Manipulate Curated Custom Entities: New in Wolfram Language 11
custom entitiesnew inwolfram languageaccessmanipulate