Group email notifications are not sent when set to Watching First Post

[pedrom (Pedro Maldonado)]

Priority/Severity: Medium

Platform: Desktop, macOS Ventura 13.3.1, Browser: Safari Version 16.4.

Description: Emails notifications are not being sent to group members when a new message is sent if Watching First Post is selected as the group notification option.

Reproducible steps:

1. Create a test group, add 2 members or more and set Watching First Post as the group notification option in the Interaction settings.

2. Send a new PM addressed to the group.

3. Check the email logs → There is no trace of emails of type user_watching_first_post sent to the group members in any of the tabs (Sent, Skipped, Bounced).

In contrast, Watching notification group emails are indeed sent.