After nix flake update nixpkgs-unstable, the build failed because it tried to evaluate tree-sitter-razor, which is marked as meta.broken, even though I do not use Razor at all.
This happened because my Emacs configuration was using treesit-grammars.with-all-grammars, which evaluates every available tree-sitter grammar.
Switching to treesit-grammars.with-grammars and explicitly listing only the required grammars resolved the issue.
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