static gas resistance on sensor readings

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Not sure if this is the right place for reporting this issue: I'm using BME688 on an Adafruit breakout with the proprietary arduino <bsec.h> library. Temperature, humidity an pressure readings work fine. Only the gas resistance is constant in every reading (12946860 Ohms), and subsequently all other derived/calculated measures (IAQ, CO2 equivalent, breath VOC equivalent) are hanging at their lowes values.

BSEC library version 1.4.8.0
Timestamp [ms], raw temperature [°C], pressure [hPa], raw relative humidity [%], gas [Ohm], IAQ, IAQ accuracy, temperature [°C], relative humidity [%], Static IAQ, CO2 equivalent, breath VOC equivalent
3496, 23.67, 102518.00, 31.25, 12946860.00, 25.00, 0, 23.67, 31.25, 25.00, 500.00, 0.50
6496, 23.68, 102517.00, 31.18, 12946860.00, 25.00, 0, 23.62, 31.29, 25.00, 500.00, 0.50
9496, 23.72, 102517.00, 31.09, 12946860.00, 25.00, 0, 23.66, 31.14, 25.00, 500.00, 0.50
12496, 23.72, 102515.00, 31.00, 12946860.00, 25.00, 0, 23.66, 31.07, 25.00, 500.00, 0.50
15495, 23.73, 102517.00, 30.93, 12946860.00, 25.00, 0, 23.67, 30.99, 25.00, 500.00, 0.50
18495, 23.73, 102517.00, 30.88, 12946860.00, 25.00, 0, 23.67, 30.96, 25.00, 500.00, 0.50

I tested with <Adafruit_BME680.h> library, which works fine and outputs reasonable and changing (slowly increasing) gas resistance values. Am I missing something? Configuration of the heater...?

I used the example script from the Arduino library.

https://github.com/boschsensortec/BSEC-Arduino-library

This repository was not updated since 3 years.

Thank you.