Improve test stability (#10913)

Content.Server/AI/Pathfinding/Accessible/AiReachableSystem.cs

@@ -445,10 +445,11 @@ namespace Content.Server.AI.Pathfinding.Accessible
             var parentChunk = node.ParentChunk;
 
             // No guarantee the node even has a region yet (if we're doing neighbor lookups)
-            if (!_regions[parentChunk.GridId].TryGetValue(parentChunk, out var regions))
-            {
+            if (!_regions.TryGetValue(parentChunk.GridId, out var chunk))
+                return null;
+
+            if (!chunk.TryGetValue(parentChunk, out var regions))
                 return null;
-            }
 
             foreach (var region in regions)
             {

Content.Server/Explosion/EntitySystems/TriggerSystem.TimedCollide.cs

@@ -19,6 +19,8 @@ public sealed partial class TriggerSystem
         //Ensures the entity trigger will have an active component
         EnsureComp<ActiveTriggerOnTimedCollideComponent>(uid);
         var otherUID = args.OtherFixture.Body.Owner;
+        if (component.Colliding.ContainsKey(otherUID))
+            return;
         component.Colliding.Add(otherUID, 0);
     }
 

Content.Server/Station/Systems/StationSystem.cs

@@ -119,7 +119,8 @@ public sealed class StationSystem : EntitySystem
     private void OnStationDeleted(EntityUid uid, StationDataComponent component, ComponentShutdown args)
     {
         if (_stations.Contains(uid) && // Was not deleted via DeleteStation()
-            _gameTicker.RunLevel == GameRunLevel.InRound) // And not due to a round restart
+            _gameTicker.RunLevel == GameRunLevel.InRound && // And not due to a round restart
+            _gameTicker.LobbyEnabled) // If there isn't a lobby, this is probably sandbox, single player, or a test
         {
             // printing a stack trace, rather than throwing an exception so that entity deletion continues as normal.
             Logger.Error($"Station entity {ToPrettyString(uid)} is getting deleted mid-round. Trace: {Environment.StackTrace}");