Did not work for me. Here is the solution you need:
Go to Truenas network settings an create a bridge. Name it (e.g. br0)
Go into your TrueNAS hosts NIC (e.g. eno1) and DELETE the host ip that connects your TrueNAS box to your LAN.
Goto br0 and add your deleted ip from eno1 as an alias.
test and save
You can now use pihole or whatever app in parallel to the new incus subsystem for VM and lxc.
Stay clean,
Doc