During development of ZBXNEXT-7071, looks like it was decided  that cache will be rebuilt every hour and trigger in problem state will only be available after an hour.

This caused that  

But this is not acceptable for the solution, as "Problem Triggers" view is inconsistent with other views where fresh Problems are counted and visible immediately - "Hostgroups" and "Triggers"

Yes, rebuild mapping table manually (by USR2 signal) helps and shows the fresh Problem triggers, but it's not acceptable by end users to be forced to reload it to see the problems.

https://git.zabbix.com/projects/ZT/repos/snmp-gateway/browse/README.md