When a web scenario step fails, Zabbix return a response time of 0 (item "web.test.time").

This means that the graph of the response time are wrong, since a response time of 0 ms changes the average and is hard to see when displaying a graph with high latency like 10 secs.

Ideally a the "web.test.time" should either return nothing or return a very high value to reflect the actual failure of the step.