revert

Author: huozhi

packages/next/src/build/index.ts

@@ -2145,8 +2145,7 @@ export default async function build(
           // If there was no result, there's nothing more to do.
           if (!exportResult) return
 
-          const postBuildSpinner = createSpinner('Finalizing page optimization')
-          ssgNotFoundPaths = exportConfig.ssgNotFoundPaths
+          ssgNotFoundPaths = Array.from(exportConfig.ssgNotFoundPaths)
 
           // remove server bundles that were exported
           for (const page of staticPages) {