The latest Logi Options+ software has the following critical bug:

My Craft keyboard has a back light and I have the setting set to OFF. Yet the backlight comes on EVEN in a brightly lit office. THIS IS DRAINING MY BATTERY

PLEASE FIX!!!

I opened another issue with the brightness buttons not working # 16052204
However I did find a workaround for that by mapping to F1 and F2...