I’m back to using the remote control to turn the TV on - I have absolutely no idea what’s happening with this integration, and find it pretty poor how dismissive the dev is of the inability of the Integration to turn the TV on natively without having to use an Automation or Template Switch.
It doesn’t seem like I’m the only person with this issue either - pretty disappointing.
Kudos to Carlos, but unfortunately this solution isn’t functional for me 
Update: Pre-2022 builds, it was quite happy turning the TV on and off via the hard wired MAC address, now it won’t do that. I’ve just gone and unplugged the hard wired 1 gbps connection to the TV, and it will once again turn on and off via the automation, but for how long I’m not sure, as it was also working last night when hard wired…
The TV firmware hasn’t updated recently, yet the Integration has.
Update 2 - Potential Fix for Hard Wired WoL - I think I may have identified a fix for WoL via a hardired connection - at some stage, it looks like LG have enabled a function called Quick Start+, whereby the TV goes into a standby state, rather than powering off. In their infinite wisdom, LG have disabled WoL via Ethernet, and only left it enabled via Wireless.
It works beautifully using wakeonlan from a Linux server, but not consistently via HA…
To turn it off Quick Start+, the setting is under TV Management:
Settings → All Settings → General → Devices → TV Management