openHAB 4.1 Release discussion

[Jetblack31 (Jetblack)]

Hi!
Since OH4.1 I have some strange calculations in DSL rules with temperatures.
It seems temperature calculations do not respect anymore what is indicated here

Working with Number:Temperature Items in rules

openHAB provides Quantity Type features, which can seem baffling. On top of that, Temperature type Quantities have a few quirks all of their own. These notes intend to guide the rules author. I’ve shown work examples in DSL rules language, see below for other scripts examples. All have similar features, if different syntax. Knowing what can be done is half the battle. What is a Quantity Type? Simply, Item states and rule variables may contain Quantities - that just means a number AND a unit …

In particular, calculating an average temperature with (5|°C + 10|°C) / 2 does not work anymore (I don’t obtain 7.5°C).

what is the workaround to be able to multiply or divide Celsius temperature with 0°C as the reference point (and not 0K as it seems to be now) ?

Thank you !