Don't use the issue loc as a differentiator for all issues

modules/core/validation/models.js

@@ -29,19 +29,13 @@ export function validationIssue(attrs) {
             parts.push(this.subtype);
         }
 
-        // include entities this issue is for
+        // include the entities this issue is for
         // (sort them so the id is deterministic)
         if (this.entityIds) {
             var entityKeys = this.entityIds.slice().sort();
             parts.push.apply(parts, entityKeys);
         }
 
-        // include loc since two separate issues can have an
-        // idential type and entities, e.g. in crossing_ways
-        if (this.loc) {
-            parts.push.apply(parts, this.loc);
-        }
-
         return parts.join(':');
     }
 

modules/validations/crossing_ways.js

@@ -494,6 +494,8 @@ export function validationCrossingWays() {
                 edges: crossing.edges,
                 connectionTags: connectionTags
             },
+            // differentiate based on the loc since two ways can cross multiple times
+            hash: JSON.stringify(crossing.crossPoint),
             loc: crossing.crossPoint,
             fixes: fixes
         });