runtime: Desktop: DataContractSerializerTests.DCS_ReadOnlyDictionary failed with "Xunit.Sdk.EqualException"

DataContractSerializerTests.DCS_ReadOnlyDictionary [FAIL]

Message:

XML comparison is also failing
Test failed for input: System.Collections.ObjectModel.ReadOnlyDictionary`2[System.String,System.Int32
Expected: <ReadOnlyDictionaryOfstringint xmlns="http://schemas.datacontract.org/2004/07/System.Collections.ObjectModel" xmlns:i="http://www.w3.org/2001/XMLSchema-instance"><_dictionary xmlns:a="http://schemas.microsoft.com/2003/10/Serialization/Arrays"><a:KeyValueOfstringint><a:Key>Foo</a:Key><a:Value>1</a:Value></a:KeyValueOfstringint><a:KeyValueOfstringint><a:Key>Bar</a:Key><a:Value>2</a:Value></a:KeyValueOfstringint></_dictionary></ReadOnlyDictionaryOfstringint>
Actual: <ReadOnlyDictionaryOfstringint xmlns="http://schemas.datacontract.org/2004/07/System.Collections.ObjectModel" xmlns:i="http://www.w3.org/2001/XMLSchema-instance"><m_dictionary xmlns:a="http://schemas.microsoft.com/2003/10/Serialization/Arrays"><a:KeyValueOfstringint><a:Key>Foo</a:Key><a:Value>1</a:Value></a:KeyValueOfstringint><a:KeyValueOfstringint><a:Key>Bar</a:Key><a:Value>2</a:Value></a:KeyValueOfstringint></m_dictionary></ReadOnlyDictionaryOfstringint>

Expected: True
Actual:   False

Stack Trace: at DataContractSerializerTests.SerializeAndDeserialize[T](T value, String baseline, DataContractSerializerSettings settings, Func`1 serializerFactory, Boolean skipStringCompare) in D:\j\workspace\outerloop_net—903ddde6\src\System.Runtime.Serialization.Xml\tests\DataContractSerializer.cs:line 2799 at DataContractSerializerTests.DCS_ReadOnlyDictionary() in D:\j\workspace\outerloop_net—903ddde6\src\System.Runtime.Serialization.Xml\tests\DataContractSerializer.cs:line 1891

Detail: https://ci.dot.net/job/dotnet_corefx/job/master/job/outerloop_netfx_windows_nt_debug/16/testReport/(root)/DataContractSerializerTests/DCS_ReadOnlyDictionary/