Send mail to admin (Adhoc not work) and mail send two time.

Thank you for the patch direction. Maybe not the place, but why does the site's email address, get a copy of everything? I guess this is a use case I don't understand.

Sending emails to site email can be disabled in notification settings form ("Disable the site email address")

Sending emails to ADHOC Mail works.
I tried to reproduce this issue on drupal 10.2.7 /
8.x-3.x-dev (Mailpit to catch emails), can not reproduce, need either more details or close this issue.

actually, the potential reason why emails are sent twice could also be
becasue of calling $node->save() insdie a hook_form_alter for the node form
that triggers the hooke_entity_update twice where the email itself is triggered
https://git.drupalcode.org/project/content_moderation_notifications/-/bl...
https://git.drupalcode.org/project/content_moderation_notifications/-/bl...