all the containers change IP addresses frequently. For home assistant a static IP address of the proxy manager is mandatory in order to reach it. For jellyfin it is useful to see which device accesses jellyfin. If the IP always changes, it doesn’t work properly.
How do I fix a container IP with podman compose (or docker)
This was a fast response, and doesn’t cover the whole scope of handling networking in docker. As mentioned elsewhere there is a different network philosophy for Standalone Containers & Overlay networking.