Job Alerts not sending

**Describe the bug**
Job Alerts are currently not being triggered on two separate sites. This has been tested with two new jobs added, alert emails are not being triggered. No emails in our email log. Our two sites have around 1200 email alerts, none of the alerts have been triggered.

**To Reproduce**
Create a job, monitor the process of the job-manager-alert hook which should trigger emails to be sent out.

**Expected behavior**
Email alerts should send when a job is added (for the alerts that match the criteria).

**Isolating the problem (mark completed items with an [x]):**
- [x] I have deactivated other plugins and confirmed this bug occurs when only WP Job Manager plugin is active.
- [x] This bug happens with a default WordPress theme active.
- [x] I can reproduce this bug consistently using the steps above.

**WordPress Environment**
- WordPress Version: 6.4.3
- WP Job Manager Version: 2.2.2
- WP Job Alerts Version: 3.0.0
- PHP Version: 8.1.27