structuredAttrs is enabled

trying https://github.com/backnotprop/plannotator/archive/refs/tags/v0.27.8.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
  0      0   0      0   0      0      0      0                              0
  0      0   0      0   0      0      0      0                              0

  0      0   0      0   0      0      0      0                              0
100 18.75M   0 18.75M   0      0 15.46M      0           00:01         18.72M
100 34.28M   0 34.28M   0      0 15.86M      0           00:02         18.72M
100 34.28M   0 34.28M   0      0 15.86M      0           00:02         18.72M
100 34.28M   0 34.28M   0      0 15.86M      0           00:02         18.72M
unpacking source archive /nix/var/nix/builds/nix-39033-1295924250/download.tar.gz