The .NET OpenAPI generator is creating duplicate models when generating from a minimal API setup in .NET 9.

[jzs11]

Describe the bug
The .NET OpenAPI generator is creating duplicate models when generating from a minimal API setup in .NET 9.

OpenApi File To Reproduce
Steps to reproduce:

• Create a .NET 9 minimal API project
• Generate OpenAPI specification using the built-in tools
• Observe the generated output contains duplicate entries

Expected behavior
The OpenAPI generator should create unique model without any duplication, properly reflecting the minimal API structure.

Screenshots/Code Snippets
Sample1

Sample2

And few others.

[captainsafia]

@jzs11 This repo is for the underlying data model used by ASP.NET Core. I'd recommend that you file this bug on the dotnet/aspnetcore repo for further investigation.

[ricardoboss]

For anyone stumbling on this issue (like I did), someone already reported this to the ASP.NET team: dotnet/aspnetcore#58968

[akamor]

@captainsafia Given your contributions on the openapi work for dotnet9 is this something you can help raise awareness of? As things currently stand, I dont see how the openapi work in dotnet 9 is useable at all for anything but very trivial schemas.

[captainsafia]

@akamor Yep, this is on my radar. Doing some investigation into the various reports at the moment. I'll post in the issue referenced in this comment once I have something.