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Multi Targetting Seems to have stopped working as workaround

See original GitHub issue

I have many times successfully created a DGML with a non-executable project by multi-targeting the project. For example, I would change a project that was originally targetting .NETStandard2.0 to:

<TargetFrameworks>netcoreapp3.0;netstandard2.0</TargetFrameworks>

Now (possibly result of a VS2019 update???) creating the DGML fails with a message that Microsoft.EntityFrameworkCore.dll cannot be found in the appliations’s bin/debug path. Example with my long path:

System.Exception: Unable to find Microsoft.EntityFrameworkCore.dll in folder C:\Users\jlerm\Downloads\getting-started-entity-framework-core\04\demos\M4 Relationships After\SamuraiApp\SamuraiApp.Data\bin\Debug\netcoreapp3.0.
   at EFCorePowerTools.Handlers.ProcessLauncher.GetEfCoreVersion(String folder) in C:\projects\efcorepowertools\src\GUI\EFCorePowerTools\Handlers\ProcessLauncher.cs:line 222
   at EFCorePowerTools.Handlers.ProcessLauncher.DropNetCoreFiles(String outputPath) in C:\projects\efcorepowertools\src\GUI\EFCorePowerTools\Handlers\ProcessLauncher.cs:line 244
   at EFCorePowerTools.Handlers.ProcessLauncher.GetOutput(String outputPath, String projectPath, GenerationType generationType, String contextName, String migrationIdentifier, String nameSpace) in C:\projects\efcorepowertools\src\GUI\EFCorePowerTools\Handlers\ProcessLauncher.cs:line 64
   at EFCorePowerTools.Handlers.ModelAnalyzerHandler.Generate(String outputPath, Project project, GenerationType generationType) in C:\projects\efcorepowertools\src\GUI\EFCorePowerTools\Handlers\ModelAnalyzerHandler.cs:line 67

I can follow Karl Shifflet’s workaround (https://github.com/ErikEJ/EFCorePowerTools/issues/451) successfully, however I cannot understand why multi-targeting is no longer working. I am using a project on the same computer that I have successfully created the dgml with many times. This seems to be the problem a number of people following my EF Core course are hitting.

##Repro Repo https://github.com/julielerman/Demo-Solution-Set-up-for-EF-Core-Power-Tools-Testing