Containers on different networks can access the host and other containers?

Following some guides on youtube, im trying to setup some more security measures, ending with putting containers in different networks, doing

docker network create proxy

creates the proxy network, that when a container is in can still access all other containers, and the host. heres what happens when i use nc to probe the ports:

443 is a docker container set to host, 8443 is the unraid webui, and 7443 is another container set to bridge, is this normal behaviour? I thought that creating another network grants the containers in it no access to any local networks, just the internet?

root@55f012343cc3:/# nc -v 192.168.1.2 443
Connection to 192.168.1.2 443 port [tcp/https] succeeded!
^C
root@55f012343cc3:/# nc -v 192.168.1.2 8443
Connection to 192.168.1.2 8443 port [tcp/*] succeeded!
^C
root@55f012343cc3:/# nc -v 192.168.1.2 7443
Connection to 192.168.1.2 7443 port [tcp/*] succeeded!
^C
root@55f012343cc3:/#