Description

Steps to reproduce:

1. Access the Zabbix web interface.

1. Navigate to Data Collect >  Templates > Discovery > Trigger prototypes 

1. Go to page 2 using the pagination control at the bottom.

Expected behavior:
The second page of trigger prototypes should load normally.

Actual behavior:
A fatal error is displayed with the following message
Fatal error, please report to the Zabbix team
– Field "parent_discoveryid" is mandatory.
– Controller: trigger.prototype.list
– Action: trigger.prototype.list
– Context: template
– Page: 2