Index: src/org/openstreetmap/josm/gui/mappaint/StyleCache.java
===================================================================
--- src/org/openstreetmap/josm/gui/mappaint/StyleCache.java	(revision 11209)
+++ src/org/openstreetmap/josm/gui/mappaint/StyleCache.java	(working copy)
@@ -48,8 +48,7 @@
             ds = new DividedScale<>();
         }
         s.states[idx] = ds.put(o, r);
-        s.intern();
-        return s;
+        return s.intern();
     }
 
     public Pair<StyleElementList, Range> getWithRange(double scale, boolean selected) {