Nix-env not working as expected; might be broken?

[Anhsirkz]

Issue description

I Tried updating Freetube version v0.21.2 Beta To the newest version using nix-env -u nixpkgs.freetube.
This resulted in warning: name collision in input Nix expressions, skipping '/nix/store/akjcpy88....

Steps to reproduce

nix-env -iA nixpkgs.freetube results in
warning: name collision in input Nix expressions, skipping '/nix/store/akjcpy88.... [30 times] evaluation warning:[...] replacing old 'freetube-0.21.2' installing 'freetube-0.21.2'

which freetube shows that the program should be installed in ~/.nix-profile/bin/freetube
Another odd behaviour is that I cannot call nix from the default zsh shell, but only from the fish shell.
nix-env -u also answers with [30 times] evaluation warning:[...]

nix-env -iA nixpkgs.st results in the following error: the user '_nixbld1' in the group 'nixbld' does not exist.

Is my nix install broken of some sorts?
What is the cleanest way to get Nix back to a working state?
Thanks.

Technical details

• system: "aarch64-darwin"
• host os: Darwin 24.2.0, macOS 15.2
• multi-user?: no
• sandbox: yes
• version: nix-env (Nix) 2.23.0
• channels(root): "nixpkgs"
• nixpkgs: ~/.nix-defexpr/channels/nixpkgs

[Anhsirkz]

The script curl --proto '=https' --tlsv1.2 -sSf -L https://github.com/NixOS/nix/raw/master/scripts/sequoia-nixbld-user-migration.sh | bash - from
NixOS/nix#10892 Did not work.

• system: "aarch64-darwin"
• host os: Darwin 24.3.0, macOS 15.3
• multi-user?: yes
• sandbox: no
• version: nix-env (Nix) 2.23.0
• channels(root): "nixpkgs"
• nixpkgs: ~/.nix-defexpr/channels/nixpkgs

I updated my computer to a newer version of MacOS.
Notice the change in sandbox and multi-user? after running the script ?!