Make sure explosions reset on round restart (#7801)

Content.Server/Explosion/EntitySystems/ExplosionSystem.cs

@@ -7,6 +7,7 @@ using Content.Shared.Camera;
 using Content.Shared.Damage;
 using Content.Shared.Database;
 using Content.Shared.Explosion;
+using Content.Shared.GameTicking;
 using Content.Shared.Throwing;
 using Robust.Server.Containers;
 using Robust.Server.Player;
@@ -67,6 +68,8 @@ public sealed partial class ExplosionSystem : EntitySystem
         SubscribeLocalEvent<ExplosionResistanceComponent, GetExplosionResistanceEvent>(OnGetResistance);
         SubscribeLocalEvent<TileChangedEvent>(OnTileChanged);
 
+        SubscribeLocalEvent<RoundRestartCleanupEvent>(OnReset);
+
         // Handled by ExplosionSystem.Processing.cs
         SubscribeLocalEvent<MapChangedEvent>(OnMapChanged);
 
@@ -76,10 +79,18 @@ public sealed partial class ExplosionSystem : EntitySystem
         InitAirtightMap();
     }
 
+    private void OnReset(RoundRestartCleanupEvent ev)
+    {
+        _explosionQueue.Clear();
+        _activeExplosion = null;
+        _nodeGroupSystem.Snoozing = false;
+    }
+
     public override void Shutdown()
     {
         base.Shutdown();
         UnsubscribeCvars();
+        _nodeGroupSystem.Snoozing = false;
     }
 
     private void OnGetResistance(EntityUid uid, ExplosionResistanceComponent component, GetExplosionResistanceEvent args)