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Error info
After some recent changes, flake overlays stopped working, narrowing down the problem this is probably because of doing overlay for git-ignore-nix which is not a package but a flake (so the package can't really receive that git-ignore-nix). Passing git-ignore-nix as a direct argument to the package fixes the overlay usage for me, should work for others too.
Example of error
error: evaluation aborted with the following error message: 'lib.customisation.callPackageWith: Function called without required argument "git-ignore-nix"