Thanks very much!
I was getting pretty frustrated. I even installed Windows to check that my BIOS settings for Wake On LAN were correct. They were, I was able to wake up my PC over the network. But as soon as I booted into Unraid and shutdown from that, WOL stopped working. This addition to /config/go fixed it.
(For reference, my motherboard is an ASRock B550 Phantom Gaming 4 with a Realtek RTL8111/8168/8411 NIC onboard)