If you want to see WOL traffic on the LAN try this tcpdump snippet
WakeMeOnLAN.exe uses port 40,000 by default so you'll miss it if you just use 9
# on a Unifi UDM
sudo tcpdump -i br99 udp port 9 or udp port 40000
Where -i br99 is the interface on a Linux based host
# on a Debian based computer
tcpdump -i enp5s0 udp port 9 or udp port 40000
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
listening on enp5s0, link-type EN10MB (Ethernet), snapshot length 262144 bytes
17:49:48.034553 IP TGN-MYPC.tgn.home.49433 > 10.11.12.255.40000: UDP, length 102
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