conflicting options: port publishing and the container type network mode

I want to use an option "--net=container:<container_id>". It's necessary to collect traffic from <container_id> container.
But when I try to do it, the container doesn't start:
Caused by: com.github.dockerjava.api.exception.BadRequestException: {"message":"conflicting options: port publishing and the container type network mode"}

Why it happens? I don't publish any port:
@Container
GenericContainer<?> container = new GenericContainer<>("alpine:latest").withNetworkMode("container:containerid");

Start by reproducing the GenericContainer configuration with withNetworkMode("container:containerid") and inspect the Docker container options that Testcontainers sends. Determine why port publishing is present or inferred despite the shown configuration, then add a regression test or document the limitation once the expected behavior is established.