diff --git a/Assets/Mirror/Core/NetworkReaderExtensions.cs b/Assets/Mirror/Core/NetworkReaderExtensions.cs
index 66326757b..8c340f01f 100644
--- a/Assets/Mirror/Core/NetworkReaderExtensions.cs
+++ b/Assets/Mirror/Core/NetworkReaderExtensions.cs
@@ -257,6 +257,8 @@ public static List<T> ReadList<T>(this NetworkReader reader)
         // structs may have .Set<T> members which weaver needs to be able to
         // fully serialize for NetworkMessages etc.
         // note that Weaver/Readers/GenerateReader() handles this manually.
+        // TODO writer not found. need to adjust weaver first. see tests.
+        /*
         public static HashSet<T> ReadHashSet<T>(this NetworkReader reader)
         {
             int length = reader.ReadInt();
@@ -269,6 +271,7 @@ public static HashSet<T> ReadHashSet<T>(this NetworkReader reader)
             }
             return result;
         }
+        */
 
         public static T[] ReadArray<T>(this NetworkReader reader)
         {
diff --git a/Assets/Mirror/Core/NetworkWriterExtensions.cs b/Assets/Mirror/Core/NetworkWriterExtensions.cs
index 05e310788..148080598 100644
--- a/Assets/Mirror/Core/NetworkWriterExtensions.cs
+++ b/Assets/Mirror/Core/NetworkWriterExtensions.cs
@@ -289,6 +289,8 @@ public static void WriteList<T>(this NetworkWriter writer, List<T> list)
         // structs may have .Set<T> members which weaver needs to be able to
         // fully serialize for NetworkMessages etc.
         // note that Weaver/Writers/GenerateWriter() handles this manually.
+        // TODO writer not found. need to adjust weaver first. see tests.
+        /*
         public static void WriteHashSet<T>(this NetworkWriter writer, HashSet<T> hashSet)
         {
             if (hashSet is null)
@@ -300,6 +302,7 @@ public static void WriteHashSet<T>(this NetworkWriter writer, HashSet<T> hashSet
             foreach (T item in hashSet)
                 writer.Write(item);
         }
+        */
 
         public static void WriteArray<T>(this NetworkWriter writer, T[] array)
         {
diff --git a/Assets/Mirror/Tests/Editor/NetworkWriterTest.cs b/Assets/Mirror/Tests/Editor/NetworkWriterTest.cs
index a0a094885..44934a4ca 100644
--- a/Assets/Mirror/Tests/Editor/NetworkWriterTest.cs
+++ b/Assets/Mirror/Tests/Editor/NetworkWriterTest.cs
@@ -1317,7 +1317,7 @@ public void TestNullList()
             Assert.That(readList, Is.Null);
         }
 
-        [Test]
+        [Test, Ignore("TODO")]
         public void TestHashSet()
         {
             HashSet<int> original = new HashSet<int>() { 1, 2, 3, 4, 5 };
@@ -1329,7 +1329,7 @@ public void TestHashSet()
             Assert.That(readHashSet, Is.EqualTo(original));
         }
 
-        [Test]
+        [Test, Ignore("TODO")]
         public void TestNullHashSet()
         {
             NetworkWriter writer = new NetworkWriter();