Hello, 

Recently, when we were organizing our environment, we tried to create a trigger dependency with another trigger containing more than 2 functions from different hosts.

After association, when we try to open the first trigger with the dependency, the frontend page of trigger configuration shows as a blank screen.

In order to recover access to the first trigger, you must remove the dependency using mass update or deleting one of the expressions from different hosts in the second trigger.

Tested in zabbix 6.0.x and 7.0.8. The problem occurs only in zabbix 7.0.8. Have not teste in other minor versions but might be caused when the popup of trigger configuration opens.

Steps to reproduce:

1. Create a normal trigger "test1" with expressions from a single host
2. Create a second trigger "test2" with expressions from 2 or more hosts
3. select the "test1" and add dependencie from trigger 2 and save
4. after save trigger "test1" try to open his configuration, a blank popup should appear

Result:
First trigger:

**

Second trigger:

Add dependency in first trigger and save:

Try to edit  the first trigger and returns a blank popup

Expected:
In zabbix 6.0 the same test can be reproduced and we get the normal exibition of the trigger configuration:

The first trigger configuration can be accessed after create the dependency: