When processing event correlation rule with 'close new' operation the new event trigger value might be set to OK even if there are open events created by this trigger.

Steps to repeat:

• import attached host configuration (or create similar one)
• create event correlation rule with Old event tag error = new event tag error condition and close new/old operations
• send the following data with sender:

  bin/zabbix_sender -z localhost -s Trapper -k strap[1] -o 'OK:2'
  bin/zabbix_sender -z localhost -s Trapper -k strap[1] -o 'ERR:1'
  bin/zabbix_sender -z localhost -s Trapper -k strap[1] -o 'OK:1'
  

Result:
Trigger Strap #1 OK value is 0 (OK) while there are still open event created by the first sender command.