What is the source of the emergency contacts?

I observed that the contacts displayed by the emergency contacts list are not in sync with the contacts app. What is the reason for that behavior ?

The contacts presented in the emergency settings are outdated.

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En français :
Paramètres > Sécurité et urgences > Informations d’urgences > Contacts d’urgence

This is well known.

The problem is, that the contact list in the emergency settings is not identical to the contacts in the contacts app.


C’est bien connu.

Le problème est que la liste de contacts des paramètres d’urgence n’est pas identique à celle de l’application Contacts.

(traduction automatique)

As you can clearly see, both lists are NOT identical. What is the source of the emergency contacts ? Is it only imported once from the contacts app ?