Pipeline tool fails, Version: 3.8.0.1375-develop

System.ArgumentException: Could not convert from string({R:0 G:0 B:0 A:0}) to Color, expected format is 'r,g,b,a'
   at Microsoft.Xna.Framework.Content.Pipeline.Builder.Convertors.StringToColorConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value) in C:\BuildAgents\MonoGameWin1\work\f7381a85a626990\MonoGame.Framework.Content.Pipeline\Builder\Convertors\StringToColorConverter.cs:line 54
   at MonoGame.Tools.Pipeline.ContentItem.ResolveTypes() in C:\BuildAgents\MonoGameWin1\work\f7381a85a626990\Tools\MonoGame.Content.Builder.Editor\Common\ContentItem.cs:line 176
   at MonoGame.Tools.Pipeline.PipelineController.ResolveTypes() in C:\BuildAgents\MonoGameWin1\work\f7381a85a626990\Tools\MonoGame.Content.Builder.Editor\Common\PipelineController.cs:line 919
   at MonoGame.Tools.Pipeline.PipelineController.OnReferencesModified() in C:\BuildAgents\MonoGameWin1\work\f7381a85a626990\Tools\MonoGame.Content.Builder.Editor\Common\PipelineController.cs:line 142
   at MonoGame.Tools.Pipeline.CellRefs.Edit(PixelLayout control) in C:\BuildAgents\MonoGameWin1\work\f7381a85a626990\Tools\MonoGame.Content.Builder.Editor\Controls\PropertyCells\CellRefs.cs:line 42
   at MonoGame.Tools.Pipeline.PropertyGridTable.<Drawable_MouseUp>b__26_0() in C:\BuildAgents\MonoGameWin1\work\f7381a85a626990\Tools\MonoGame.Content.Builder.Editor\Controls\PropertyGridTable.cs:line 236
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.DispatcherOperation.InvokeImpl()
   at MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(Object obj)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location where exception was thrown ---
   at MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Windows.Threading.DispatcherOperation.Invoke()
   at System.Windows.Threading.Dispatcher.ProcessQueue()
   at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
   at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
   at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
   at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
   at System.Windows.Threading.Dispatcher.Run()
   at System.Windows.Application.RunDispatcher(Object ignore)
   at System.Windows.Application.RunInternal(Window window)
   at System.Windows.Application.Run(Window window)
   at Eto.Wpf.Forms.ApplicationHandler.Run()
   at Eto.Forms.Application.Run(Form mainForm)
   at MonoGame.Tools.Pipeline.Program.CommandLineInterface.Run(InvocationContext context, String project) in C:\BuildAgents\MonoGameWin1\work\f7381a85a626990\Tools\MonoGame.Content.Builder.Editor\Program.cs:line 110