Hook: report_send_complete

[Thr33]

vB 4.2.5
PHP 7.3.33
MySQL 5.7.43

I'm trying to run a custom plugin when the hook 'report_send_complete' is called. It isn't running my plugin.

Troubleshooting report
I've tested my plugin on 'report_start' and it runs perfectly so that tells me it's the hook.
I have a product which creates a new thread when a post is reported, could this mean it's bypassing the 'report_send_complete' hook? Or is there is a CRON delay on updating the database?