fix

assets/sass/_theme/blocks/chapter.sass

@@ -3,8 +3,7 @@
         margin-bottom: 0
     .notes
         margin-top: $spacing-3
-        *
-            @include small(false)
+        @include small
         sub, sup
             font-size: 60%
             margin-left: 0

assets/sass/_theme/design-system/typography.sass

@@ -137,12 +137,11 @@ h2, .h2
 .signature
     @include signature
 
-@mixin small($apply_weight: true)
+@mixin small
     font-family: $small-font-family
     font-size: var(--small-size)
     line-height: var(--small-line-height)
-    @if $apply_weight
-        font-weight: $small-weight
+    font-weight: $small-weight
 
 small, .small
     @include small