BSEC2 v1.8 getting stuck on SAMD21

[hundertvolt]

I have a stable working implementation of BSEC2 version v1.7.2502 on an Adafruit qtPy SAMD21.

With the update to BSEC2 v1.8.2610, it will run as usual for some gas classification iterations, but then, after less than a minute, get stuck after the last measurement of an iteration. It simply stops outputting values; the microcontroller as such is not stopped (fully reactive to other functions in my "full" implementation), and envSensor.run() is still being called. There is no error reported (all flags == 0) from BSEC or the BME6xx sensor library.

Moreover, I found it trivial to be reproduced: Just compile and upload the basic_config_state example (without any changes!) provided with the library to an Adafruit qtPy SAMD21 with a BME688 connected to it. And after some measurement iterations, it will stop outputting values after one measurement with class probability outputs / gas index = 9.

Reverting the BSEC libraty to v1.7.2502 alone will make it work again.