@odata.bind not working

Context

• ASP.NET Core 6
• Microsoft.AspNetCore.OData: 8.0.12

Description
Given the following datamodel:

public class Item
{
    public int Id { get; set; }
    [Required]
    public string Name { get; set; }
    [Required]
    public Group Group { get; set; }
}

public class Group
{
    public int Id { get; set; }
    [Required]
    public string Name { get; set; }
}

This controller:

// POST /Items
public async Task<IActionResult> Post([FromBody] Item item)
{
    if (!ModelState.IsValid) return BadRequest(ModelState);
    _context.Items.Add(item);
    await _context.SaveChangesAsync();
    return Created(item);
}

And assuming the following Group entity already exists in the DB:

{
    "Id": 1,
    "Name": "Groceries"
}

What would be the correct payload body to create a new Item entity with the relationship to the already existing category?
In the OData spec I've found mention of the following syntax:

{
    "Name": "Carrot",
    "Group@odata.bind": "Groups(1)"
}

Which should then automatically resolve the id to the actual object from the DB context during model binding of the 'item' input parameter of the POST action. However clearly this doesn't work. So what is the correct way of doing something like this?

Start with the shown POST /Items action and the Item and Group model definitions, then verify how Microsoft.AspNetCore.OData 8.0.12 handles @odata.bind during model binding. Reproduce the request using the provided Group record and determine the supported payload or binding behavior; done means a new Item is created with its existing Group relationship and valid model state.