Stadia is off, tv is off, chromecast turns the tv on in the middle of the night.
This has been reported multiplied times. I'm not turning off the hdmi cec
I've never had this problem with the CCU on any of my TVs, and CEC is always hit or miss but one thing you can try is to plug the CCU into a device in between the TV like a cheap HDMI switch if you don't have an AV receiver. There isn't any way to disable CEC for the CCU only.
I assume you've tried disconnecting the CCU and verifying that the problem stops to rule out something unrelated to the CCU being the cause?
I've never had this problem with the CCU on any of my TVs, and CEC is always hit or miss but one thing you can try is to plug the CCU into a device in between the TV like a cheap HDMI switch if you don't have an AV receiver. There isn't any way to disable CEC for the CCU only.
I assume you've tried disconnecting the CCU and verifying that the problem stops to rule out something unrelated to the CCU being the cause?