IKEA VINDSTYRKA summarizes hazardous to health values as "excellent" air quality

Hey guys,
I don’t know which category fits best for this issue.
I have a conbee 2 and it works perfectly fine as bridge for Apple Home.

I have a IKEA VINDSTYRKA Air Quality Sensor connected to conbee 2 and it works so far. Just one exception:

It always summarizes the air quality as “excellent” and pushes this value to Apple Home as “very good” (= “sehr gut” in german language")
It does this, even when the values are hazardous to health, like shown in this screenshot:



What can be done, to change this “excellent” and “very good” air quality value to bad, very bad, hazardous to health?

(“Feinstaub” means “fine dust” in german)

The device itself summarizes the value as “dark red” on the integrated display:

Firmware on Vindstyrka is: Version 1.0.010
Phoscon Gateway Version: 2.31.2
Phoscon Firmware: 26780700

Homebridge deCONZ plugin: v1.2.10

I did the following to check for improvement:
Vindstyrka Firmware: 1.0.11
Phoscon App: 2.32.4 (beta)

But the behaviour is the same, unfortunatelly:


Is it a settings related topic or is there an adjustment in the phoscon app neccessary?