structuredAttrs is enabled

trying https://github.com/gitbutlerapp/gitbutler/archive/refs/tags/release/0.21.1.tar.gz
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed
  0      0   0      0   0      0      0      0                              0
100  6.58M   0  6.58M   0      0  5.65M      0           00:01              0
unpacking source archive /nix/var/nix/builds/nix-48864-1461713315/download.tar.gz