I have updated to nixos-unstable to the most recent commit (i.e. 0aa475546ed21629c4f5bbf90e38c846a99ec9e9) and I am still getting the error (which i think is the same that uep mentioned)

The error is

error:
       … while calling the 'head' builtin
         at /nix/store/8dh0832snzamw6wk2rdfjz29xdzgma49-source/lib/attrsets.nix:1574:11:
         1573|         || pred here (elemAt values 1) (head values) then
         1574|           head values
             |           ^
         1575|         else

       … while evaluating the attribute 'value'
         at /nix/store/8dh0832snzamw6wk2rdfjz29xdzgma49-source/lib/modules.nix:846:9:
          845|     in warnDeprecation opt //
          846|       { value = addErrorContext "while evaluating the option `${showOption loc}':" value;
             |         ^
          847|         inherit (res.defsFinal') highestPrio;

       … while evaluating the option `system.build.toplevel':

       … while evaluating definitions from `/nix/store/8dh0832snzamw6wk2rdfjz29xdzgma49-source/nixos/modules/system/activation/top-level.nix':

       … while evaluating the option `warnings':

       … while evaluating definitions from `/nix/store/8dh0832snzamw6wk2rdfjz29xdzgma49-source/nixos/modules/system/boot/systemd.nix':

       … while evaluating the option `systemd.services.wyoming-openwakeword.serviceConfig':

       … while evaluating definitions from `/nix/store/8dh0832snzamw6wk2rdfjz29xdzgma49-source/nixos/modules/services/home-automation/wyoming/openwakeword.nix':

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: expected a list but found the partially applied built-in function 'concatMap': «partially applied primop concatMap»