So when I reboot my Pi 4, the TV (LG) and receiver (Marantz) turns on.
I have this set in the /flash/config.txt: hdmi_ignore_cec_init=1
Before I used OSMC with that same option, but that went fine.
Also messed a bit with the CEC settings. Used the default and the settings I used in OSMC. But that made no difference.
So what else can I try?