JavaScript appears to work, but sourcemaps for CSS point to the compiled CSS file. In dev mode, this is still helpful, as it has the filename and will open the code up to the correct line in DevTools; however, line numbers don't match up, because the sourcemap references the compiled CSS file and isn't aware of how the non-compiled file in the assets directory looks.
JavaScript appears to work, but sourcemaps for CSS point to the compiled CSS file. In dev mode, this is still helpful, as it has the filename and will open the code up to the correct line in DevTools; however, line numbers don't match up, because the sourcemap references the compiled CSS file and isn't aware of how the non-compiled file in the assets directory looks.