Fix ActionPool bugs

Solver/Simulator.cs

@@ -8,6 +8,7 @@ namespace Craftimizer.Solver;
 internal sealed class Simulator : SimulatorNoRandom
 {
     public readonly ActionPool Pool;
+    private readonly ActionType[] poolActions;
     private readonly int maxStepCount;
 
     public override CompletionState CompletionState
@@ -24,6 +25,7 @@ internal sealed class Simulator : SimulatorNoRandom
     public Simulator(in ActionPool pool, int maxStepCount)
     {
         Pool = pool;
+        poolActions = Pool.AcceptedActions;
         this.maxStepCount = maxStepCount;
     }
 
@@ -135,7 +137,7 @@ internal sealed class Simulator : SimulatorNoRandom
             return new();
 
         var ret = new ActionSet();
-        foreach (var action in Pool.AcceptedActions)
+        foreach (var action in poolActions)
             if (CanUseAction(action, strict))
                 ret.AddAction(in Pool, action);
         return ret;