[BUG] Notification condition stopping sending notification

[Mikescotland]

Sergey
Could you shed some light and explain what this condition in the notification automation does:

condition: template
value_template: '{{ trigger.to_state.state != trigger.from_state.state }}'

I was manually testing on my pics and first notification has been sent, however subsequent were blocked in HA:

Thank you

[skrashevich]

This condition is necessary so that notifications don't duplicate.

[Mikescotland]

For some kind of reasons, after some time (minutes, maybe 10 or something), this automation throws completely empty notification, or even two.
Is there any mqtt message just saying X has been detected? It is super hard to make any automation based on this entity.