Have you tried resetting the CEC settings to default? If in doubt, stop kodi and delete the CEC settings file (systemctl stop kodi; rm /storage/.kodi/userdata/peripheral_data/cec_CEC_Adapter.xml) and reboot.
LE 12.2 ships with a newer libcec (latest version 7.1.1 instead of the ancient 4.0.7 in LE12) and some of your old settings may be incompatible or wrong.
so long,
Hias
Worked for me. Had the same issue on an Inte NUC5 Connected to a Panasonic via a Yamaha AVR. Going to default settings and setting the HDMI Port to the port number it‘s plugged in to the AVR did the trick.