CEC problem with 8.0.x

When I update from 7.0.3 to 8.0.x there's a strange behavior with my RPi, I've tried everything but I need some help.
I've RPi connected to a LG LCD, and I also have a LG soundbar connected to the same TV by HDMI. When I turn on the TV it takes a few seconds to turn on the soundbar. With libreelec 8.0.x every time the soundbar turns on the tv switch to the RPi input, with 7.0.3 (and older versions) this never happened. I've downgrade and it stops happening without changing any config.