The bug is only partially fixed on LG -27UK600. (macOS 14.1 ~ 14.3.1)
The external monitor still wake up randomly in night...
sleep -> several hours bug free -> [display on -> display off -> display on -> display off] -> several hours bug free.
The display on/off loop count are decreased from infinite to several times.
I was waked up by it today, and I feel so bad.