/$count segment not present on functions returning collection

Hi,

I have a EntitySet and Function bound to Patient EntityType like this:
builder.EntitySet("Patients").EntityType.Collection.Function("GetLookup").ReturnsCollection();

I have PatientsController, with function GetLookup:
[HttpGet, EnableQuery]
public IActionResult GetLookup()
{
return Ok(DataContext.Set());
}

I can access ~/odata/Patients/GetLookup()?$select=Id ... etc queries just fine.

But there isn't ~/odata/Patients/GetLookup()/$count. What is the problem?

Uri convention (https://www.odata.org/documentation/odata-version-2-0/uri-conventions/) states that, Service Operation (which returns a Collection of Entries) should have /$count.

Best regards,
Petko Stoyanov