Problem with Include() EntityFramework Core with blazor server side

Question

I have a problem with Include() using Entity Framework. I have two models:

public class Project
    {
        [Key]
        public int Id { get; set; }
        [Required]
        [Display(Name = "Project Title")]
        public string Title { get; set; }
        // Some other properties


        public int ProjectPropertyId { get; set; }
        public ProjectProperty ProjectProperty { get; set; } = new ProjectProperty();

    }

and the other table:

public class ProjectProperty
    {
        [Key]
        public int Id { get; set; }

        [Required]
        [Display(Name = "Published")]
        public bool Published { get; set; } = false;
        [Required]
        [Display(Name = "Code Available")]
        public bool CodeAvailable { get; set; } = false;
    }

When I save a new entity with those properties, No problem. When I want to retrieve, here the problem is. I can get the Project list, but it doesn't include the Project property Entity. This is the code to get the list:

public async Task<List<Project>> GetProjects()
        {
            return await _context.Project.Include(p => p.ProjectProperty).ToListAsync();
        }

On the break point I get this:

I can't get that entity with Include() but in the database:

I know I did a stupid mistake, but I can't figure it out. any help will be appreciated thank you.