diff --git a/Streamistry.Core/Pipes/Aggregators/Average.cs b/Streamistry.Core/Pipes/Aggregators/Average.cs
index 346cd6e..ce8bd1b 100644
--- a/Streamistry.Core/Pipes/Aggregators/Average.cs
+++ b/Streamistry.Core/Pipes/Aggregators/Average.cs
@@ -22,8 +22,6 @@ public AverageState<T> Append(T? value)
 
     public readonly T? Select()
         => count > T.Zero ? total / count : default;
-
-    public static readonly AverageState<T> @Default = new();
 }
 
 public class Average<T> : Aggregator<T, AverageState<T>, T> where T : INumber<T>
@@ -40,7 +38,7 @@ protected Average(Expression<Action<Aggregator<T, AverageState<T>, T>>>? complet
         : base(upstream
             , (x, y) => x.Append(y)
             , (x) => x.Select()
-            , AverageState<T>.Default
+            , new AverageState<T>()
             , completion)
     { }
 }
@@ -61,7 +59,7 @@ protected Average(Expression<Action<Aggregator<T, AverageState<U>, U>>>? complet
         : base(upstream
             , (x, y) => x.Append(y is null ? default : U.CreateChecked(y))
             , (x) => x.Select()
-            , AverageState<U>.Default
+            , new AverageState<U>()
             , completion)
     { }
 }
diff --git a/Streamistry.Core/Pipes/Aggregators/Max.cs b/Streamistry.Core/Pipes/Aggregators/Max.cs
index d9d0586..58fd4d3 100644
--- a/Streamistry.Core/Pipes/Aggregators/Max.cs
+++ b/Streamistry.Core/Pipes/Aggregators/Max.cs
@@ -23,8 +23,6 @@ public MaxState<T> Append(T? value)
 
     public readonly T? Select()
         => IsEmpty ? default : Value;
-
-    public static readonly MaxState<T> @Default = new();
 }
 
 public class Max<TInput> : Aggregator<TInput, MaxState<TInput>, TInput> where TInput : INumber<TInput>
@@ -41,7 +39,7 @@ protected Max(Expression<Action<Aggregator<TInput, MaxState<TInput>, TInput>>>?
         : base(upstream
             , (x, y) => x.Append(y)
             , (x) => x.Select()
-            , MaxState<TInput>.Default
+            , new MaxState<TInput>()
             , completion)
     { }
 }
diff --git a/Streamistry.Core/Pipes/Aggregators/Median.cs b/Streamistry.Core/Pipes/Aggregators/Median.cs
index 470fcfb..61eaaf3 100644
--- a/Streamistry.Core/Pipes/Aggregators/Median.cs
+++ b/Streamistry.Core/Pipes/Aggregators/Median.cs
@@ -40,8 +40,6 @@ public MedianState<T> Append(T? value)
             return left;
         return ((left / T.CreateChecked(2)) + (right / T.CreateChecked(2)) + (T.IsOddInteger(left) && T.IsOddInteger(right) ? T.One : T.Zero));
     }
-
-    public static readonly MedianState<T> @Default = new();
 }
 
 public class Median<TInput> : Aggregator<TInput, MedianState<TInput>, TInput> where TInput : INumber<TInput>
@@ -54,7 +52,7 @@ protected Median(Expression<Action<Aggregator<TInput, MedianState<TInput>, TInpu
         : base(upstream
             , (x, y) => x.Append(y)
             , (x) => x.Select()
-            , MedianState<TInput>.Default
+            , new MedianState<TInput>()
             , completion)
     { }
 }
@@ -71,7 +69,7 @@ protected Median(Expression<Action<Aggregator<TInput, MedianState<TOuput>, TOupu
         : base(upstream
             , (x, y) => x.Append(y is null ? default : TOuput.CreateChecked(y))
             , (x) => x.Select()
-            , MedianState<TOuput>.Default
+            , new MedianState<TOuput>()
             , completion)
     { }
 }
diff --git a/Streamistry.Core/Pipes/Aggregators/Min.cs b/Streamistry.Core/Pipes/Aggregators/Min.cs
index ca7c158..8a83b8e 100644
--- a/Streamistry.Core/Pipes/Aggregators/Min.cs
+++ b/Streamistry.Core/Pipes/Aggregators/Min.cs
@@ -23,8 +23,6 @@ public MinState<T> Append(T? value)
 
     public readonly T? Select()
         => IsEmpty ? default : Value;
-
-    public static readonly MinState<T> @Default = new();
 }
 
 public class Min<TInput> : Aggregator<TInput, MinState<TInput>, TInput> where TInput : INumber<TInput>
@@ -41,7 +39,7 @@ protected Min(Expression<Action<Aggregator<TInput, MinState<TInput>, TInput>>>?
         : base(upstream
             , (x, y) => x.Append(y)
             , (x) => x.Select()
-            , MinState<TInput>.Default
+            , new MinState<TInput>()
             , completion)
     { }
 }
diff --git a/Streamistry.Core/Streamistry.csproj b/Streamistry.Core/Streamistry.csproj
index 19f02a9..5152279 100644
--- a/Streamistry.Core/Streamistry.csproj
+++ b/Streamistry.Core/Streamistry.csproj
@@ -30,4 +30,8 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageReference>
   </ItemGroup>
+
+  <ItemGroup>
+    <Folder Include="Pipes\Windows\" />
+  </ItemGroup>
 </Project>
diff --git a/Streamistry.Testing/Pipes/Aggregators/MaxTests.cs b/Streamistry.Testing/Pipes/Aggregators/MaxTests.cs
index 9df0e3e..c6fcd19 100644
--- a/Streamistry.Testing/Pipes/Aggregators/MaxTests.cs
+++ b/Streamistry.Testing/Pipes/Aggregators/MaxTests.cs
@@ -5,6 +5,7 @@
 using System.Threading.Tasks;
 using NUnit.Framework;
 using Streamistry.Pipes.Aggregators;
+using Streamistry.Pipes.Sources;
 using Streamistry.Testability;
 
 namespace Streamistry.Testing.Pipes.Aggregators;
@@ -34,4 +35,18 @@ public void Emit_ManyElements_CorrectResults()
         Assert.That(aggregator.EmitAndGetOutput(22), Is.EqualTo(22));
         Assert.That(aggregator.EmitAndGetOutput(10), Is.EqualTo(22));
     }
+
+    [Test]
+    public void Emit_TwoAggregatorsInParallel_CorrectResults()
+    {
+        var source = new EnumerableSource<int>(new[] { 15, 22, 10 });
+        var pipeline = new Pipeline(source);
+        var aggregator1 = new Max<int>(source);
+        var filter = new Filter<int>(source, x => x < 20);
+        var aggregator2 = new Max<int>(filter);
+
+        var data = aggregator2.GetOutputs(pipeline.Start);
+        Assert.That(data, Does.Not.Contain(22));
+        Assert.That(data, Does.Contain(15));
+    }
 }