Steps to reproduce:

1. I have created a trigger, which successfully generates "Information" problem, when "Error" word is added to monitored log file.
2. I need that "Information" problem disappear after 5 minutes. So I configured Recovery expression as 

3. {Template:log[/var/log/alerts/alerts.log,"Error"].nodata(300)}=1
   

1. After a while the problem still shows in active problem list.

Result:
See screenshot...
See log file...
See memory dump...
Expected:

See screenshot....
See attached patch file...