Steps to reproduce:

1. Create an item, that collects a numerical value, that rarely changes (5m update interval)
2. Configure pre-processing "Discard unchanged with heartbeat" for the item with 1h
3. Create a Trigger for the item: {test-item.min(*30m*)}

   <>0

4. Change the Value from 0 -> 1

Result:

The Trigger Event fires immediately, although the lowest value in the last 30m was 0, it's just not written anywhere in the database (obviously)

See screenshots:

Pre-processing

Trigger

Graph 1h

Graph 30m

Expected:
"min" should work, even when using "discard with heartbeat"

Notes:

Of course I understand why it behaves that way. But isn't it still wrong?

Or am I using the wrong Trigger expression for my goal, especially when using it together with discard unchanged?

Should I have to adjust my discard to be < then my min trigger, to make this work? For example:
Discard unchanged with heartbeat always has to < then the time value in the "min" function to work properly?