structuredAttrs is enabled

trying https://github.com/MrLesk/Backlog.md/archive/refs/tags/v1.50.1.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  6.56M   0  6.56M   0      0  8.09M      0                              0
unpacking source archive /nix/var/nix/builds/nix-75112-274614281/download.tar.gz