Yep it’s this.
I have try to set my VPN IP in the network 192.168.1.0/24 and nothing work…
My vpn work but i can ping none machines of my network
But when i want reach my gateway with my VPN i have the interface of Truenas too 
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Got an Email that it works and come to congratulate you, but seems message was updated 
Yes… It’s a false positive ^^’
With this new message you have a little idea for again help me ? 
Sorry have no Truenas in hand
Seems similar discussion is on other forum and problem is common: https://www.truenas.com/community/threads/openvpn-server-routing-on-truenas-12-0-u1-1.90723/
Check it out, there are few hints more bounded to the Truenas setup.
Official Documentation does not mention anything about this issue https://www.truenas.com/docs/core/services/openvpn/