diff --git a/tests/bcl-test/macOS-xammac_net_4_5_System.Core_xunit-test.dll.ignore b/tests/bcl-test/macOS-xammac_net_4_5_System.Core_xunit-test.dll.ignore
deleted file mode 100644
index 7aa3b1e606..0000000000
--- a/tests/bcl-test/macOS-xammac_net_4_5_System.Core_xunit-test.dll.ignore
+++ /dev/null
@@ -1,13 +0,0 @@
-# blocks testing app
-System.IO.Pipes.Tests.AnonymousPipeTest_Read_ServerIn_ClientOut.ReadFromPipeWithClosedPartner_ReadNoBytes
-System.IO.Pipes.Tests.AnonymousPipeTest_Read_ServerIn_ClientOut.ValidWriteAsync_ValidReadAsync_APM
-System.IO.Pipes.Tests.AnonymousPipeTest_Read_ServerIn_ClientOut.ReadWithZeroLengthBuffer_Nop
-System.IO.Pipes.Tests.AnonymousPipeTest_Read_ServerIn_ClientOut.ValidWriteAsync_ValidReadAsync
-System.IO.Pipes.Tests.AnonymousPipeTest_Read_ServerOut_ClientIn.ReadWithZeroLengthBuffer_Nop
-System.IO.Pipes.Tests.AnonymousPipeTest_Read_ServerOut_ClientIn.ValidWriteAsync_ValidReadAsync_APM
-System.IO.Pipes.Tests.AnonymousPipeTest_Read_ServerOut_ClientIn.ValidWriteAsync_ValidReadAsync
-System.IO.Pipes.Tests.AnonymousPipeTest_Read_ServerOut_ClientIn.ReadFromPipeWithClosedPartner_ReadNoBytes
-System.IO.Pipes.Tests.AnonymousPipeTest_Write_ServerIn_ClientOut.ValidFlush_DoesntThrow
-System.IO.Pipes.Tests.AnonymousPipeTest_Write_ServerIn_ClientOut.WriteZeroLengthBuffer_Nop
-System.IO.Pipes.Tests.AnonymousPipeTest_Write_ServerOut_ClientIn.WriteZeroLengthBuffer_Nop
-System.IO.Pipes.Tests.AnonymousPipeTest_Write_ServerOut_ClientIn.ValidFlush_DoesntThrow
\ No newline at end of file
diff --git a/tests/bcl-test/macOSModern-xammac_net_4_5_System.Core_xunit-test.dll.ignore b/tests/bcl-test/macOSModern-xammac_net_4_5_System.Core_xunit-test.dll.ignore
index 825655f808..9954d54381 100644
--- a/tests/bcl-test/macOSModern-xammac_net_4_5_System.Core_xunit-test.dll.ignore
+++ b/tests/bcl-test/macOSModern-xammac_net_4_5_System.Core_xunit-test.dll.ignore
@@ -1,4 +1,16 @@
-# System.PlatformNotSupportedException : Operation is not supported on this platform.
+# System.PlatformNotSupportedException : Operation is not supported on this platform. Mono issue: https://github.com/mono/mono/issues/15329
+System.IO.Pipes.Tests.AnonymousPipeTest_Read_ServerIn_ClientOut.ReadFromPipeWithClosedPartner_ReadNoBytes
+System.IO.Pipes.Tests.AnonymousPipeTest_Read_ServerIn_ClientOut.ValidWriteAsync_ValidReadAsync_APM
+System.IO.Pipes.Tests.AnonymousPipeTest_Read_ServerIn_ClientOut.ReadWithZeroLengthBuffer_Nop
+System.IO.Pipes.Tests.AnonymousPipeTest_Read_ServerIn_ClientOut.ValidWriteAsync_ValidReadAsync
+System.IO.Pipes.Tests.AnonymousPipeTest_Read_ServerOut_ClientIn.ReadWithZeroLengthBuffer_Nop
+System.IO.Pipes.Tests.AnonymousPipeTest_Read_ServerOut_ClientIn.ValidWriteAsync_ValidReadAsync_APM
+System.IO.Pipes.Tests.AnonymousPipeTest_Read_ServerOut_ClientIn.ValidWriteAsync_ValidReadAsync
+System.IO.Pipes.Tests.AnonymousPipeTest_Read_ServerOut_ClientIn.ReadFromPipeWithClosedPartner_ReadNoBytes
+System.IO.Pipes.Tests.AnonymousPipeTest_Write_ServerIn_ClientOut.ValidFlush_DoesntThrow
+System.IO.Pipes.Tests.AnonymousPipeTest_Write_ServerIn_ClientOut.WriteZeroLengthBuffer_Nop
+System.IO.Pipes.Tests.AnonymousPipeTest_Write_ServerOut_ClientIn.WriteZeroLengthBuffer_Nop
+System.IO.Pipes.Tests.AnonymousPipeTest_Write_ServerOut_ClientIn.ValidFlush_DoesntThrow
 System.IO.Pipes.Tests.AnonymousPipeTest_CreateClient.CreateClientStreamFromStringHandle_Valid
 System.IO.Pipes.Tests.AnonymousPipeTest_CreateServer.ValidConstructors
 System.IO.Pipes.Tests.AnonymousPipeTest_CreateServer.InOutPipeDirection_Throws_NotSupportedException