Steps to reproduce:
1. Create a Zabbix Trapper item with Trigger and three random groups. Put a host in one of the groups. Mine was {HOST.key.last()}>10 and Trigger severity Disaster.
2. Add an Action with conditions:
A and B and (C or D or E)

• A. Not in maintenance
• B. Trigger severity >= High
• C. Host group <> Group1
• D. Host group <> Group2
• E. Host group <> Group3

And operations:

• Send email notification.

Result:
The notification was received, however shouldn't because host is attached to the one of the listed groups.

Expected:
As per condition the Action shouldn't be performed.

Regards,
Aleksejs!