when I got to check why some web scenario's triggers didn't fired up, I discovered that after upgrading from 3.0.4 to 3.2 all items and triggers related to all web scenarios disappeared.

I tried to add a new web scenario (as I used to do in previous versions) and any new item has been added to the host, but web scenario graphs still work.
(Web monitoring items says zabbix should automatically create items based on scenario)

This happened on 2 zabbix server upgraded from 3.0.4 to 3.2 (1 on debian 7, 1 on centos 7).

I'm not using templated web scenarios