EF Core Add-Migration only includes key columns [Answered]

[Table("Transl", Schema = "public")]
public class Transl
{
    [Required]
    public string Symbol;

    [Required]
    public string LanguageIso;

    [Required]
    public string Translation;

    public Transl() {}
}

public class ApplicationDbContext : DbContext
{
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options) : base(options) { }

    public DbSet<Lang> Lang { get; set; }
    public DbSet<Transl> Transl { get; set; }

    protected override void OnModelCreating(ModelBuilder builder) {
        base.OnModelCreating(builder);
        builder.Entity<Transl>().HasKey(x => new { x.Symbol, x.LanguageIso });

    }
}

        _builder.Services.AddDbContext<ApplicationDbContext>(options =>
            options.UseNpgsql(_builder.Configuration.GetConnectionString("DefaultConnection")));

No referenced design-time services were found