Weirdness with item transforms and properties with quotes

[rolfbjarne]

I'm not sure if this is a bug, or if it's been reported already, but this:

<Project>
  <PropertyGroup>
    <StuffWithQuotes>What's Up</StuffWithQuotes>
    <StuffWithoutQuotes>Down Under</StuffWithoutQuotes>
  </PropertyGroup>
  <ItemGroup>
    <ItemGroupWithQuotes Include="@(EmptyItemGroup->'$(StuffWithQuotes)')" />
    <ItemGroupWithoutQuotes Include="@(EmptyItemGroup->'$(StuffWithoutQuotes)')" />
  </ItemGroup>
  <Target Name="Build">
    <Warning Text="ItemGroupWithQuotes=@(ItemGroupWithQuotes)" />
    <Warning Text="ItemGroupWithoutQuotes=@(ItemGroupWithoutQuotes)" />
  </Target>
</Project>

Prints:

warning ItemGroupWithQuotes=@(EmptyItemGroup->What's Up)
warning ItemGroupWithoutQuotes=

I'd expect the "ItemGroupWithQuotes" line to behave like the "ItemGroupWithoutQuotes" line.