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Created attachment 4650 [details]
MSBuild ItemGroup/Item properties are not preserved when the .csproj changes.
1. Extract App-NestedProps.zip, then open App.sln
2. Note that App.csproj contains this fragment:
3. Within the Solution panel, right-click the App project then click Add > New
4. Within the New File dialog, select General > Empty Class. Click New.
5. View App.csproj.
Expected behavior: the lines mentioned in (2) is unchanged.
Actual behavior: the nested elements are lost:
<FooProp Include="%24%28IntermediateOutputPath%29\Foo.cs" />
This can cause the build to break, depending on how these properties are used.
Pro-tip: these are "item metadata", not "properties".
And the reason why they're lost is because the item is removed and a new one is added, because of bug 14004.
*** This bug has been marked as a duplicate of bug 14004 ***