Why does Minimal API Scaffold generated `PUT` endpoint not update the model properties?

The code generated by the Minimal API Scaffolder includes:
- Get all items
- Get item by key
- Update existing item
- Add a new item
- Delete an item

All of them contain the minimal required code to do what is expected, except the **Update existing item** that misses the step to update all the model properties with the new provided value and instead include the comment `//update model properties here`

``` C#
routes.MapPut("/api/SampleModel/{id}", async (int Id, SampleModel sampleModel, SampleModelContext db) =>
{
var foundModel = await db.Samples.FindAsync(Id);

if (foundModel is null)
{
return Results.NotFound();
}
//update model properties here

await db.SaveChangesAsync();

return Results.NoContent();
})
```

Is that the expected behavior? What is the reason behind this decision?