Shopify please address this issue. It makes developing with SCSS annoying without the benefit of source maps.
I am attempting to solve this issue by preprocessing SCSS locally but I ran into another issue where
/*# sourceMappingURL=theme.css.map */
loads an old version of the source map because it doesn't generate the trailing ?v=xxxxxxx and I can't think of any way to generate that since it's not a .liquid file.