nswag openapi2csclient generates class twice - compilation error

[srad]

I just updated from 13.19.0 to 14.0.7 and it seems that the swagger2csclient has been removed.
I switched to openapi2csclient now, but the generated code is vaulty. It generates the client class twice into the same file and hence causes an compilation error.

The command I ran: .\nswag\Net80\dotnet-nswag.exe openapi2csclient /input:http://somewhere:1234/swagger/v1/swagger.json /classname:MyApiClient /namespace:SomeWhere.Clients /output:.\Somewhere\Clients\MyApiClient.cs

here is the generated code. I collapsed everything except of the classes and the entire code is inserted twice:

[j-hap]

When you define a single class name, but there are multiple endpoints in the openapi description with overlapping names, those are generated inside the same class, which yields duplicate code, see #2660