WiFi with multiple IP addresses on Ventura

In previous macOS versions, I used multiple (fixed) IP addresses on WiFi connections. I created a duplicate service and set a fixed IP address to it. This is not possible in Ventura - I can create second WiFi, but if I set the IP it changes also the IP address settings of the original WiFi connection. Does anybody know how to add multiple IP addresses to one WiFi / ethernet interface under macOS Ventura, please?