Suppose we go to "Monitoring" -> "Events" and view events for host A. We then go to "Monitoring" -> "Dashboard" and, in "Last 20 issues" widget, click on the link in "Last change" column for a trigger that pertains to host B.

On the opened page the trigger filter is correctly set to the trigger we want to see. However, because we have previously selected host A for viewing, no events are shown.