our backoffice extension is using grunt to convert the .sass files to .css files.
When I run an ant clean all, Hybris will automatically executed the copy_extension_sass target and process the .sass files as desired.
However, when I run the same on a different installation, it does not. I can see in the build console, that the npmancillary is definitely included and I can even see some Running grunt packageSkipTests output - thus I assume grunt is generally functional. It does never execute the copy_extension_sass target though and therefore the .css files are not available then at runtime.