';' errouneously appended during chained script blocks

[pete3n]

This code:

script = pkgs.writeShellScriptBin "script_name" (
if condition then # sh
''
#!/usr/bin/env sh
''
else # sh
''
#!/usr/bin/env sh
''

Becomes:

script = pkgs.writeShellScriptBin "script_name" (
if condition then # sh
''
#!/usr/bin/env sh
'';
else # sh
''
#!/usr/bin/env sh
''

After formatting, which is invalid.