Static routing table not working ( 6.12.8 )

I have 2 internet lines, 1 i use for everything, the other just to download from one specific host.

On my old Debian server, it was a simple and easy setup. 2 Physical network interfaces,  ETH0 was getting IP address 192.168.8.x from DHCP, ETH1 had a manual IP address, 172.16.1.100 and not filled in any GW on this interface. (GW is 172.16.1.254)

So i made a static route for this specific host (in example) 1.2.3.4, just by editing the network script in something that is similar to route add 1.2.3.4/32 via 172.16.1.254 dev eth1

This worked fine for years.

Now in Unraid, im trying to re-create the same setup, by using it's CLI.

So what i did.

In the Network settings:

ETH0, gets DHCP IP address within 192.168.8.x range, ETH1 have a manual IP address, 172.16.1.101 and not filling in any GW for this interface.

Then at static route, i create 172.16.1.0/24 and put ETH1 in the second box, leave the metric at default, witch is 1.

Then i add a second static route, 1.2.3.4/32 and on second box 172.16.1.254, metric also on default 1.

This does not seem working. I can't ping the dedicated host for ETH1. When i remove both my static routes, it pings again, but obviously on ETH0.

It's most likely an user error, but what I'm doing wrong here ?