Index: resources/data/validator/geometry.mapcss
===================================================================
--- resources/data/validator/geometry.mapcss	(revision 18328)
+++ resources/data/validator/geometry.mapcss	(working copy)
@@ -252,7 +252,7 @@
   group: tr("{0} inside {1}", "power", "power");
 }
 
-/* isolated nodes which should be part of a way; #10825, #15478 */
+/* isolated nodes which should be part of a way; #10825, #15478, #21688 */
 node:unconnected:in-downloaded-area[entrance],
 node:unconnected:in-downloaded-area[traffic_calming],
 node:unconnected:in-downloaded-area[highway=passing_place],
@@ -265,7 +265,6 @@
 node:unconnected:in-downloaded-area[highway=traffic_signals],
 node:unconnected:in-downloaded-area[highway=crossing],
 node:unconnected:in-downloaded-area[crossing],
-node:unconnected:in-downloaded-area[highway=milestone],
 node:unconnected:in-downloaded-area[railway=milestone],
 node:unconnected:in-downloaded-area[railway=crossing],
 node:unconnected:in-downloaded-area[railway=level_crossing],