Bandaid pathpoly neighbors for now (#12337)

Content.Server/NPC/Pathfinding/PathfindingSystem.Grid.cs

@@ -89,13 +89,13 @@ public sealed partial class PathfindingSystem
             // TODO: Often we invalidate the entire chunk when it might be something as simple as an airlock change
             // Would be better to handle that though this was safer and max it's taking is like 1-2ms every half-second.
             var dirt = new GridPathfindingChunk[comp.DirtyChunks.Count];
-            var i = 0;
+            var idx = 0;
 
             foreach (var origin in comp.DirtyChunks)
             {
                 var chunk = GetChunk(origin, comp.Owner, comp);
-                dirt[i] = chunk;
-                i++;
+                dirt[idx] = chunk;
+                idx++;
             }
 
             // We force clear portals in a single-threaded context to be safe
@@ -119,7 +119,7 @@ public sealed partial class PathfindingSystem
             // This is for map <> grid pathfinding
 
             // Without parallel this is roughly 3x slower on my desktop.
-            Parallel.For(0, dirt.Length, i =>
+            for (var i = 0; i < dirt.Length; i++)
             {
                 // Doing the queries per task seems faster.
                 var accessQuery = GetEntityQuery<AccessReaderComponent>();
@@ -129,7 +129,7 @@ public sealed partial class PathfindingSystem
                 var physicsQuery = GetEntityQuery<PhysicsComponent>();
                 var xformQuery = GetEntityQuery<TransformComponent>();
                 BuildBreadcrumbs(dirt[i], mapGridComp.Grid, accessQuery, destructibleQuery, doorQuery, fixturesQuery, physicsQuery, xformQuery);
-            });
+            }
 
             const int Division = 4;