diff --git a/src/libraries/Common/tests/System/Collections/IEnumerable.NonGeneric.Tests.cs b/src/libraries/Common/tests/System/Collections/IEnumerable.NonGeneric.Tests.cs
index a9152629a5f5f..5760cbef9069c 100644
--- a/src/libraries/Common/tests/System/Collections/IEnumerable.NonGeneric.Tests.cs
+++ b/src/libraries/Common/tests/System/Collections/IEnumerable.NonGeneric.Tests.cs
@@ -133,7 +133,6 @@ public void IEnumerable_NonGeneric_Enumerator_MoveNext_AfterEndOfCollection(int
         }
 
         [Theory]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/51723", typeof(PlatformDetection), nameof(PlatformDetection.IsBrowser), nameof(PlatformDetection.IsMonoAOT))]
         [MemberData(nameof(ValidCollectionSizes))]
         public void IEnumerable_NonGeneric_Enumerator_MoveNext_ModifiedBeforeEnumeration_ThrowsInvalidOperationException(int count)
         {
@@ -147,7 +146,6 @@ public void IEnumerable_NonGeneric_Enumerator_MoveNext_ModifiedBeforeEnumeration
         }
 
         [Theory]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/51723", typeof(PlatformDetection), nameof(PlatformDetection.IsBrowser), nameof(PlatformDetection.IsMonoAOT))]
         [MemberData(nameof(ValidCollectionSizes))]
         public void IEnumerable_NonGeneric_Enumerator_MoveNext_ModifiedDuringEnumeration_ThrowsInvalidOperationException(int count)
         {
@@ -163,7 +161,6 @@ public void IEnumerable_NonGeneric_Enumerator_MoveNext_ModifiedDuringEnumeration
         }
 
         [Theory]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/51723", typeof(PlatformDetection), nameof(PlatformDetection.IsBrowser), nameof(PlatformDetection.IsMonoAOT))]
         [MemberData(nameof(ValidCollectionSizes))]
         public void IEnumerable_NonGeneric_Enumerator_MoveNext_ModifiedAfterEnumeration_ThrowsInvalidOperationException(int count)
         {
@@ -251,7 +248,6 @@ public virtual void Enumerator_Current_AfterEndOfEnumerable_UndefinedBehavior(in
         }
 
         [Theory]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/51723", typeof(PlatformDetection), nameof(PlatformDetection.IsBrowser), nameof(PlatformDetection.IsMonoAOT))]
         [MemberData(nameof(ValidCollectionSizes))]
         public virtual void Enumerator_Current_ModifiedDuringEnumeration_UndefinedBehavior(int count)
         {
@@ -286,7 +282,6 @@ public void IEnumerable_NonGeneric_Enumerator_Reset_BeforeIteration_Support(int
         }
 
         [Theory]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/51723", typeof(PlatformDetection), nameof(PlatformDetection.IsBrowser), nameof(PlatformDetection.IsMonoAOT))]
         [MemberData(nameof(ValidCollectionSizes))]
         public void IEnumerable_NonGeneric_Enumerator_Reset_ModifiedBeforeEnumeration_ThrowsInvalidOperationException(int count)
         {
@@ -300,7 +295,6 @@ public void IEnumerable_NonGeneric_Enumerator_Reset_ModifiedBeforeEnumeration_Th
         }
 
         [Theory]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/51723", typeof(PlatformDetection), nameof(PlatformDetection.IsBrowser), nameof(PlatformDetection.IsMonoAOT))]
         [MemberData(nameof(ValidCollectionSizes))]
         public void IEnumerable_NonGeneric_Enumerator_Reset_ModifiedDuringEnumeration_ThrowsInvalidOperationException(int count)
         {
@@ -316,7 +310,6 @@ public void IEnumerable_NonGeneric_Enumerator_Reset_ModifiedDuringEnumeration_Th
         }
 
         [Theory]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/51723", typeof(PlatformDetection), nameof(PlatformDetection.IsBrowser), nameof(PlatformDetection.IsMonoAOT))]
         [MemberData(nameof(ValidCollectionSizes))]
         public void IEnumerable_NonGeneric_Enumerator_Reset_ModifiedAfterEnumeration_ThrowsInvalidOperationException(int count)
         {