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Fix: Swagger UI shows Unable to render this definition after upgrading to .NET 11

startdebugging.net · published 19 August 2026

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https://learn.microsoft.com/en-us/aspnet/core/breaking-changes/11/openapi-version-default-3-2?view=aspnetcore-10.0

learn.microsoft.com

https://learn.microsoft.com/en-us/aspnet/core/breaking-changes/11/microsoft-openapi-3x?view=aspnetcore-10.0

learn.microsoft.com

https://learn.microsoft.com/en-us/aspnet/core/fundamentals/openapi/aspnetcore-openapi?view=aspnetcore-10.0

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https://github.com/microsoft/OpenAPI.NET/releases

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https://github.com/scalar/scalar/issues/6020

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Migrate from Swashbuckle to the built-in OpenAPI generator in .NET 11 Read at the source ↗

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