I've read here that is a common problem and is related to the keyboard firmware, some people said it worked fine in the past but not anymore. When ASUS is going to fix this little but annoying issue ?
Is pretty frustrating when a 150$ keyboard has such a small software flaw that can be fixed probably in 10 minutes by ASUS but keeps getting ignored for months.
It is working properly, my ROG Falchion shows the battery percentage when I bring it out of sleep mode.
Make sure you have the wireless dongle connected and the switch on the ROG Falchion set to on.