For some time I have had a dummy Trapper item configured called "maintenance" which has never had any data sent to it, and then a time based trigger for that item.

Once we upgraded to 3.2.5 this trigger stopped alerting at the specified time.

I validated that when I downgrade back to 3.2.4-2 then it works as expected.

Maybe this bug was introduced by the work done for https://support.zabbix.com/browse/ZBX-11444? That seemed to be the only semi-related change in the 3.2.5 release notes.

To reproduce:
1. Create a Trapper Item with any name and key and settings, although I used:
Type of Information: Numeric (unsigned)
Data type: Decimal

2. Create a time based trigger on that item, such as:

{<template>:maintenance.time()} > 110000

obviously replacing the template name with your own, or on a host, and the maintenance key to your key. And time time of day to something relevant.

Expect: After 11AM that the trigger would trip
Actual: nothing happens

Then try on a 3.2.4-2 installation and it will work.