Visual Studio 2019 not picking up CS generated files

Hi,

I have created dot net core dll project. CS files for this project will be files generated by tool (Apache Thrift compiler) but output dll is not picking up generated file. I have added the pre build set to generate the file.

Repro Steps:

1. Build solution

2. Open the ThriftSample.dll with object brower. (Delete the generated cs files and bin, com and obj folder.)

Actual: Nothing is there in ThriftSample.dll

Expected: Generated CS code should be there.

Note: I have checked CS file is generated. Attached is the sample project. 

SampleProject