Regression: Building a project in a sln file using target stopped working in 16.10

[xt1]

Issue Description

• have a solution file with lots of CPP vcxproj files, some in solution folders.

• msbuild ConsoleApp2.sln /t:Folder\ClassLibrary2

• Worked in MSBuild 16.9

• Produces target missing errors in 16.10

  error MSB4057: The target " Folder\ClassLibrary2" does not exist in the project.

Steps to Reproduce

• MSBuildRepro.zip attached
• msbuild ConsoleApp2.sln /t:Folder\ClassLibrary2

Expected Behavior

Build compiles ClassLibrary2 + ClassLibrary1 without errors

Actual Behavior

error MSB4057: The target " Folder\ClassLibrary2" does not exist in the project.

Versions & Configurations

16.10.0+4242f381a on windows 10 - does not work.

MsBuildRepro.zip

[joshuasmartin]

I noticed this same bug on Azure DevOps. The Pipeline was working fine until two days ago and all of a sudden we're seeing these errors. No changes. Output just shows a successful build at 1.183.0 and the failed builds at 1.187.0

[rainersigwald]

Duplicate of #6373

[rainersigwald]

The fix will be released with Visual Studio 16.10.1.

[rainersigwald]

VS 16.10.1 is now released.