How to make Swagger UI work with .NET 9's OpenAPI

[rjperes]

I am trying to setup Swagger UI so as to use the OpenAPI included in the .NET 9 project templates.
I essentially added this:

app.UseSwaggerUI(static options => { options.SwaggerEndpoint("/openapi/v1.json", "My API V1"); });

The /openapi/v1.json file is accessible, however, Swagger UI always complaints about a missing version attribute:

Unable to render this definition
The provided definition does not specify a valid version field.

Please indicate a valid Swagger or OpenAPI version field. Supported version fields are swagger: "2.0" and those that match openapi: 3.x.y (for example, openapi: 3.1.0).

However, inspecting the JSON document, I can see it's there:

{ "openapi": "3.0.4", "info": { "title": "WebApi | v1", "version": "1.0.0" },

What am I missing? Using the latest versions of all of the packages.
I understand this may be related to #10247. Is there any way to fix this before this issue gets merged?
Thanks!

[rjperes]

OK, it works with OpenAPI V2.

[ibakirov]

For now [Bug]: 7.2.0, json doc says "openapi": "3.0.4", but this doesn't seem supported by UI and waiting for merge and release #10247