Event correlation rules are not working if "NOT" is used in condition containing old event tag.

Steps to reproduce:

1. Create Zabbix trapper item on any host
   
2. Create trigger on the same host
   
3. Create global correlation rule
   
   
4. Send data using zabbix_sender command two times:
   zabbix_sender -z <zabbix server ip> -s <host name> -k Test_EC_not -o 6

Result:
The first problem generated by the trigger is not closed by the global correlation rule as should be:

Expected:
The first problem should be closed by the correlation rule when the new problem arrived.