OK, thanks.
Now looking in switches, wich shows MAC in MAC table, so this works.
In my OPNSense (other PC) in log there are requests coming, but it seems, answer is blocked ?!
2022-01-31T09:57:21
Informational
dhcpd
DHCPOFFER on 10.1.3.20 to xx:xx:xx:xx:xx:xx (WinProx) via re1_vlan50...