When a new issue is published, notification emails are sent before the issue is actually public

[carzamora]

Describe the bug
When publishing a new issue the notification emails are sent first and then the issue is published, so if the list of users is large the email will arrive first and if a user tries to review the new content they will not see it available.

To Reproduce
Steps to reproduce the behavior:

Prepare an issue for publication
Be sure to enable the plugin “Email Issue Table of Contents”
Publish the number with the "Send notification email to all registered users" option enabled.
While the emails are being sent, check the website in another browser, you will see that it is not updated yet.
You can also wait until arrive the email notification with the Table of Contents (if you are using the plugin in step 2) and click on an article link, the link will appear broken.
What application are you using?
OJS 3.2.1.4 with the plugin Email Issue Table of Contents v1.0.2.2

Additional information
I check the server when emails are being sent, after 300 emails sent and several minutes, the site content was still not updated. And finally the confirmation window did not close (but that is not a problem).