moved mixins include on BB

blockbase/sass/base/_style.scss

@@ -3,6 +3,7 @@
  * - Reset the browser
  */
 
+@import "mixins";
 @import "normalize";
 @import "breakpoints";
 

blockbase/sass/blocks/_post-comments.scss

@@ -1,5 +1,4 @@
 @import 'button-mixins';
-@import '../base/mixins';
 
 .wp-block-post-comments {
 	label, .comment-meta {