$ docker run -ti nixos/nix:2.30.2
bash-5.2# ls -lsa /root/
total 16
4 drwxr-xr-x 3 root root 4096 Jan  1  1980 .
4 drwxr-xr-x 1 root root 4096 Aug  6 18:26 ..
4 lrwxrwxrwx 1 root root   74 Jan  1  1980 .nix-channels -> /nix/store/wb9abgrwawwmdpdkj8jx9j4cnpp93b7h-base-system/root/.nix-channels
4 drwxr-xr-x 2 root root 4096 Jan  1  1980 .nix-defexpr
bash-5.2#
bash-5.2# nix profile list --extra-experimental-features nix-command
bash-5.2#

$ docker run -ti nixos/nix:2.29.1
bash-5.2# ls -lsa /root/
total 16
4 drwxr-xr-x 3 root root 4096 Jan  1  1980 .
4 drwxr-xr-x 1 root root 4096 Aug  6 18:31 ..
4 lrwxrwxrwx 1 root root   74 Jan  1  1980 .nix-channels -> /nix/store/gmkw6bw21s67hf01c93k39wf0dsp9gy7-base-system/root/.nix-channels
4 drwxr-xr-x 2 root root 4096 Jan  1  1980 .nix-defexpr
0 lrwxrwxrwx 1 root root   29 Jan  1  1980 .nix-profile -> /nix/var/nix/profiles/default

bash-5.2# nix profile list --extra-experimental-features nix-command
Name:               bash-interactive
Store paths:        /nix/store/41pi0jiyvlhxgpfhxzvb44w1skc8yp4z-bash-interactive-5.2p37

Name:               coreutils-full
Store paths:        /nix/store/9rf6b6s2cs8r62srk00arcydf8xd59jy-coreutils-full-9.7

.....