Did anyone ever got a tcp (not http) connection working with istio or is this another documented non-feature?

I am trying for a few days now to get my tcp connection to a service in k8s working.
The connection does not show up. The kialid does not show the tcp ingress port.
Just the http connections

After reading that the UDP proxy is also not working and maybe never implemented (despite of being documented) and other people have problems with tcp connections, I wonder if this is another feature, which shows up in the documentation but is not implemented ?!?

Why did someone implement a configuration parser with documentation for options which are not implemented?
This is very not cool!