macOS Sequoia breaks existing Lix installations
macOS Sequoia changed the user ID ranges used by the system, such that some of the IDs for existing Nix build users got used by the system instead.
To fix this on your system, run the Lix installer with the repair sequoia option:
curl -sSf -L https://install.lix.systems/lix | sh -s -- repair sequoia
You may run this before or after updating to Sequoia (to run it before the upgrade, add --move-existing-users to the end of the command); it just migrates the user IDs used by Lix to a range recommended by Apple.
Relevant links: