No EDM model in action request

Microsoft.AspNetCore.OData 8.0.3

EDM model

builder.EntitySet<TestA>("TestAs");
builder.EntityType<TestA>().Action("Test")
    .ReturnsCollectionFromEntitySet<TestA>("TestAs");

Controller

public class TestAsController : ODataController
{
    [HttpPost]
    public IActionResult Test()
    {
        return (Created(new[] { new TestA(), new TestA() }));
    }
}

Request

POST /api/TestAs/Test HTTP/1.1
OData-MaxVersion: 4.0
Accept: application/json;odata.metadata=minimal
Accept-Charset: UTF-8

Result

HTTP/1.1 500 Internal Server Error
Transfer-Encoding: chunked
Content-Type: text/plain; charset=utf-8
Server: Microsoft-IIS/10.0
X-Powered-By: ASP.NET
Date: Wed, 03 Nov 2021 12:35:05 GMT

System.InvalidOperationException: The request must have an associated EDM model. Consider registering Edm model calling AddOData().
   at Microsoft.AspNetCore.OData.Results.ResultHelpers.GenerateODataLink(HttpRequest request, Object entity, Boolean isEntityId)
   at Microsoft.AspNetCore.OData.Results.CreatedODataResult`1.GenerateLocationHeader(HttpRequest request)
   at Microsoft.AspNetCore.OData.Results.CreatedODataResult`1.ExecuteResultAsync(ActionContext context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeResultFilters>g__Awaited|28_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|20_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)

HEADERS
=======
Accept: application/json;odata.metadata=minimal
Accept-Charset: UTF-8
OData-MaxVersion: 4.0

What am I doing wrong here?

Start with ResultHelpers.GenerateODataLink and CreatedODataResult in the stack trace, then inspect how the controller request is configured with AddOData and its EDM model. Reproduce the POST request and verify that it no longer returns the missing-model exception and produces the expected response.