Accessor can't be accessed through HasMany Relationship

Project.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Project extends Model
{
    public function getFooAttribute()
    {
        return 'Bar';
    }
    
    public function users()
    {
        return $this->hasMany(User::class);
    }
}

TestController.php

<?php

namespace App\Http\Controllers;

class TestController extends Controller
{
	public function index()
	{
		App\Project::first()->foo; // prints 'Bar'
		
		App\User::first()->bar; // prints 'Foo'
		
		App\Project::first()->users->first()->bar; // prints 'null'
		
		App\User::first()->project->foo; // prints 'null'
	}
}

User.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class User extends Model
{
    public function getBarAttribute()
    {
        return 'Foo';
    }
  
    public function project()
    {
        return $this->belongsTo(Project::class);
    }
}