evaluation failure when using newest unstable nixpkgs version

[Libadoxon]

Describe the bug
When using the latest unstable nixpkgs as well as the nixd overlay evaluation fails.

Logs (Required)

error: nix_2_25 has been removed. use nix_2_28.

Configuration
N/A

To Reproduce

• Use latest nixos-unstable nixpkgs branch (f675531bc7e6657c10a18b565cfebd8aa9e24c14)
• Add nixds overlay nixpkgs.overlays
• add nixd to home/system packages
• try to evaluate

Expected behavior
Evaluation without failure

Screenshots
N/A

Additional context
When using the flake inputs directly without overwriting the nixpkgs input everything works as intended.