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Sass BOM in concatenated CSS silently breaks selectors with PostCSS 8.5.24+ under webpack
When using Next.js webpack with PostCSS 8.5.24+ and Sass, a BOM emitted by Sass at the start of each module is preserved in the middle of the concatenated CSS asset. This leading U+FEFF becomes part of the first selector of affected modules, causing those CSS rules to silently fail to match elements. The build succeeds without warnings.