diff --git a/src/AcDream.App/Audio/OpenAlAudioEngine.cs b/src/AcDream.App/Audio/OpenAlAudioEngine.cs
index ba4f249a..959415ea 100644
--- a/src/AcDream.App/Audio/OpenAlAudioEngine.cs
+++ b/src/AcDream.App/Audio/OpenAlAudioEngine.cs
@@ -82,7 +82,7 @@ public sealed unsafe class OpenAlAudioEngine : IAudioEngine, IWorldAudioQuiescen
         public bool InUse;
         public uint PriorityBase; // raw priority from SoundEntry.Priority
     }
-    private readonly Slot3D[] _pool3D = new Slot3D[PoolSize3D];
+    private readonly Slot3D[] _pool3D = CreateWorldSlots();
     private int _pool3DCursor; // round-robin start
     private bool _worldAudioSuspended;
 
@@ -159,7 +159,7 @@ public sealed unsafe class OpenAlAudioEngine : IAudioEngine, IWorldAudioQuiescen
             for (int i = 0; i < PoolSize3D; i++)
             {
                 uint src = _resources.Create3DSource();
-                _pool3D[i] = new Slot3D { SourceId = src, InUse = false };
+                _pool3D[i].SourceId = src;
             }
 
             // UI sources are source-relative (attached to listener) so they
@@ -520,4 +520,12 @@ public sealed unsafe class OpenAlAudioEngine : IAudioEngine, IWorldAudioQuiescen
         slot.PriorityBase = 0;
         slot.InUse = false;
     }
+
+    private static Slot3D[] CreateWorldSlots()
+    {
+        var slots = new Slot3D[PoolSize3D];
+        for (int i = 0; i < slots.Length; i++)
+            slots[i] = new Slot3D();
+        return slots;
+    }
 }
diff --git a/tests/AcDream.App.Tests/Audio/OpenAlResourceLifetimeTests.cs b/tests/AcDream.App.Tests/Audio/OpenAlResourceLifetimeTests.cs
index f2c4e115..bcf599eb 100644
--- a/tests/AcDream.App.Tests/Audio/OpenAlResourceLifetimeTests.cs
+++ b/tests/AcDream.App.Tests/Audio/OpenAlResourceLifetimeTests.cs
@@ -89,6 +89,21 @@ public sealed class OpenAlResourceLifetimeTests
         Assert.Equal(1, api.CloseDeviceCalls);
     }
 
+    [Fact]
+    public void UnavailableEngineWorldQuiescenceRemainsASafeNoOp()
+    {
+        var api = new RecordingApi { ContextResult = 0 };
+        var engine = new OpenAlAudioEngine(new Factory(api));
+
+        engine.SuspendWorldAudio();
+        engine.StopAllForOwner(0x50000001u);
+        engine.ResumeWorldAudio();
+
+        Assert.False(engine.IsAvailable);
+        Assert.True(engine.IsDisposalComplete);
+        Assert.Empty(api.GeneratedSources);
+    }
+
     private sealed class Factory(IOpenAlResourceApi api) : IOpenAlResourceApiFactory
     {
         public IOpenAlResourceApi Create() => api;