I'm in a process of migrating older theme to use sections and use slate. I'm migrating it to use SCSS instead of css as well. Problem is that it loads the SCSS perfectly fine in "Customize theme" but neither slate browserify nor theme preview load it and just give me 422 for the files.
I've already tried cleaning my caches, using different browsers and opening it in incognito mode. Same problem everywhere.
Any help would be appreciated.