We have the same (or similar problem). The problem I see is that SassCompiler is trying to find @import files relative to the current working directory, and not relative to the file that @import contains.
There may be several ways, depending on what you are trying to do.
My workaround was to create a temporary copy of the directory structure and then update all the @import statements in each file to make them relative to the working directory before compiling.
UPDATE I got this working without this hack, passing all the paths to the "includePaths" parameter. I tried this before, but I used relative paths. If you use absolute paths, then it works.
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