DNS over Wireguard VPN

[kermitxyz]

I have an entry in UnboundDNS > overrides - "host@localdomain"   which resolves to a local IP on my LAN (say 192.168.10.45)

Inside the LAN I can ping just "host" and get connectivity

However when I am connected to OPNSense via Wireguard VPN I have to use "host@localdomain" rather than just "host" (the latter does not resolve)

Please could anyone explain why and if this can be changed?

Many thanks