XmlDocumentationProvider - "output char buffer is too small to contain the decoded characters"

[robdcgnx]

string file = "Cognex.Designer.Core.xml";
var provider = new XmlDocumentationProvider(file);

throws an ArgumentException when attempting load the attached xml into the XmlDocumentationProvider.

*Had to rename it to .txt instead of .xml
Cognex.Designer.Core.txt

Using 5.5.1 pulled from nuget.org

The output char buffer is too small to contain the decoded characters, encoding 'Unicode (UTF-8)' fallback 'System.Text.DecoderExceptionFallback'.
Parameter name: chars
at System.Text.Encoding.ThrowCharsOverflow()
at System.Text.Encoding.ThrowCharsOverflow(DecoderNLS decoder, Boolean nothingDecoded)
at System.Text.UTF8Encoding.GetChars(Byte* bytes, Int32 byteCount, Char* chars, Int32 charCount, DecoderNLS baseDecoder)
at System.Text.DecoderNLS.Convert(Byte* bytes, Int32 byteCount, Char* chars, Int32 charCount, Boolean flush, Int32& bytesUsed, Int32& charsUsed, Boolean& completed)
at System.Text.DecoderNLS.Convert(Byte[] bytes, Int32 byteIndex, Int32 byteCount, Char[] chars, Int32 charIndex, Int32 charCount, Boolean flush, Int32& bytesUsed, Int32& charsUsed, Boolean& completed)
at ICSharpCode.NRefactory.Documentation.XmlDocumentationProvider.LinePositionMapper.GetPositionForLine(Int32 line)
at ICSharpCode.NRefactory.Documentation.XmlDocumentationProvider.ReadMembersSection(XmlTextReader reader, LinePositionMapper linePosMapper, List`1 indexList)
at ICSharpCode.NRefactory.Documentation.XmlDocumentationProvider.ReadXmlDoc(XmlTextReader reader)
at ICSharpCode.NRefactory.Documentation.XmlDocumentationProvider..ctor(String fileName)
at XmlDocProviderBug.Program.Main(String[] args) in C:\Users\rdunbar\Desktop\Temp\XmlDocProviderBug\XmlDocProviderBug\Program.cs:line 15
at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()