Why is visual studio IIS express trying to run asp.net full framework app with ASPNetCore Module?

I have a solution created in Visual Studio 2017, with full framework ASP.NET MVC targeting v4.6.1, and angular 1.x. But for some reason, when I F5 Run the solution, it attempts to run using IIS Express AspNetCore Module, which is causing it to lead to

HTTP Error 502.5 - Process Failure

Looking in event logs shows this as well

Application 'MACHINE/WEBROOT/APPHOST/WEBAPPLICATION1' with physical root 'C:\Git\Angular1Demos\AngularDemo\' failed to start process with commandline '%LAUNCHER_PATH% %LAUNCHER_ARGS%', ErrorCode = '0x80070002 : 0.

Why is the module getting in the way here?

So strange. I was able to workaround the issue by creating a new solution file in Visual Studio 2015, referencing the same project as the solution that was created in VS 2017. This time it works. Sounds like an issue with VS 2017.