Mail is also sent to users who block GitLab

Users who block GitLab do not receive notification emails.
https://gitlab-docs.creationline.com/ee/user/admin_area/blocking_unblocking_users.html
※ The official GitLab 12.7.0 document I use also stated that users who blocked it would not receive notification emails.

Notification mail (push information, etc.) is sent to GitLab users even though they have blocked them.

When I looked at the production.log in https://localhost/admin/logs, I found the following log:

Sent mail to blocked user email address (192.9ms)

GitLab 12.7.0
CentOS 7.6.1810 (Core)

Prevent notification mail from flying to blocked users.

The cause of this problem is completely unknown.
If you do not have enough information to investigate the cause, please do not hesitate to let us know.
Thank you for your cooperation.