Scheduled Saved Search Missing Results

Hello r/NetSuite

I'm currently having issues with a scheduled saved search not sending results to all recipients within the results.

The saved search does have 19000 results however it is setup to send to 'recipient from results'.

This is working for the majority and emails are sending as expected however there are a small amount that aren't getting the emails.

I can see the recipient's in the results but the sent email list proves they didn't get it.

I've noticed that the sent email list stops around 1300 results when the search individual results are about 3000.

Is there anything I can check or is netsuite hitting limitations somewhere?