Notifications to HR do not always list all tasks (FYI list)

Hello,

We are facing an issue regarding the notifications that are sent to the HR. We are using the combine notification:

And the notifications and reminder in each task has these options enabled (the owner of the task is always the HR):

Yet, it seems that there is an inconsistency in the list of tasks that are sent in the notification email. Here are two examples, one with all listed and one with the FYI missing:

Any insight on why this inconsistency occurs would be appreciated.

Thank you,

Ioannis