Index: /trunk/styles/standard/elemstyles.mapcss
===================================================================
--- /trunk/styles/standard/elemstyles.mapcss	(revision 9102)
+++ /trunk/styles/standard/elemstyles.mapcss	(revision 9103)
@@ -4884,5 +4884,5 @@
 area[setting("partial_fill")]:closed2 {
     fill-extent: 25;
-    fill-extent-threshold: 70%;
-}
-
+    fill-extent-threshold: 50%;
+}
+