When I wrote the message I was really tired and a bit in panic.
My apologies I had forgotten to reboot after that everything was fine.
I did an upgrade because DNS resolution was broken and didn't realize on the moment it was the DHCP's fault.
I explain what I wanted to do,
PosteX have two network cards Ethernet and Wireless each with a different MAC address, I wanted this computer to have the same IPv4 whatever the card he's connected with.
On snapshot kernel version 5.4.99 when I putted in Network -> DHCP and DNS -> Static Leases
PosteX twice with the same name and IP address with different MAC the DNS resolution was broken.
Same thing with 5.4.101 because after the upgrade problem was still there and had to found out why.
I don't know if this normal or a bug and if it's possible to do what I wanted ?
Why the Linksys MR8300 (ipq40xx) is just in snapshot and not in stable version ?
It doesn't seem possible to generate the wireguard keys and export the configuration files directly in lucy or did I missed something ?
In DHCP and DNS - Static Leases it could be nice to have the possibility like in Firewall - Port Forwards to be able to move the row and change the order.