Derivation filtered Temperature isn't changing when there's no temperature change

[RubenKelevra]

Derivation filtered Temperature might get stuck over 3 if there's no temperature update, since the temperature is constant.

This is a home assistant limitation - I don't know a workaround yet to get this value to update by having the temperature assumed to be constant for the time without updates...

A workaround might be to ignore if the value hasn't been updated for a while - like larger than the window - which would not show 0 anyway if calculated correctly.