Disable NAT through OpenVPN Server

OpenVPN Server: on openWRT Router
OpenWRT Router has a lan subnet: 192.168.5.0/24

OpenVPN Subnet passed to clients: 192.168.8.0/24


When I (client) connect to the OpenVPN Server:
- I get assigned an IP for example 192.168.8.2
- with a gateway IP: 192.168.8.1

Avahi is running to forward mdns packets through to the OpenVPN which works.
Problem:
- All mdns traffic source is the gateway ip, 192.168.8.1. I want it to come from the original device IP from the LAN.

See attached pictures.