I upgraded my .NET 8 solution to .NET 9 and replaced SwaggerGen with the new OpenAPI that .NET 9 provides. This is how everything related to this feature is setup in my program:

...

builder.Services.AddOpenApi("dev");

...

if (app.Environment.IsDevelopment())
{
    app.MapOpenApi();
    app.MapScalarApiReference();

    app.UseHttpLogging();
}

...

app.Use(async (ctx, next) =>
{
    ctx.Request.EnableBuffering();
    await next(ctx);  // -> exception 

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