OLED48CX6LB and LG DSN7Y goes to OPT instead of ARC
A solution for future searchers: I've found out for the combination OLED48CX6LB and LG DSN7Y it always goes to OPT instead of ARC - while the TV is set to ARC and the cables are connected correctly - IF the soundbar is set to Quick Power On. If you set it to Quick Power Off - it will work and select ARC instead of OPT.
And a question: How do we bring this to someone's attention so the firmware can hopefully be fixed and updated? It's quite a shame it can't use Quick Power On