bug: fix entity list removing free indexes

Author: JayArrowz

NetScape.Modules.World/PlayerEntityList.cs

@@ -12,7 +12,7 @@ public class PlayerEntityList : IEntityList<Player>
     {
         private readonly Player[] _entities = new Player[2048];
         private int _entityCount = 0;
-        private List<int> _freeIndexes = new();
+        private readonly List<int> _freeIndexes = new();
 
         public void Add(Player entity)
         {
@@ -32,14 +32,14 @@ public void Add(Player entity)
 
         private void SetIndex(Player entity, int index)
         {
+            _freeIndexes.Remove(index);
             entity.Index = index;
             _entities[index] = entity;
         }
 
         public void Remove(Player entity)
         {
             _entities[entity.Index] = null;
-            _freeIndexes.Remove(entity.Index);
             Interlocked.Decrement(ref _entityCount);
         }