Bug #64216 Generated script contains varbinary without length and wrong alter table

Description:
Hello,
I'm using entity framework code-first approach to create tables in database.
This code is used to create tables:

var dbCreationScript = ((IObjectContextAdapter)context).ObjectContext.CreateDatabaseScript();
context.Database.ExecuteSqlCommand(dbCreationScript);

But generated script has errors.
1. It creates varbinary type from byte[] and does not specify the length of varbinary like "varbinary(0)".
With varbinary I get exception that script is incorrect.
With varbinary(0) it goes ok.

2. Incorrect alter table commands pointing to nonexist tables.

For example this class is used as entity:

    public partial class ShippingMethod : BaseEntity, ILocalizedEntity
    {
        private ICollection<Country> _restrictedCountries;

        /// <summary>
        /// Gets or sets the name
        /// </summary>
        public virtual string Name { get; set; }

        /// <summary>
        /// Gets or sets the description
        /// </summary>
        public virtual string Description { get; set; }

        /// <summary>
        /// Gets or sets the display order
        /// </summary>
        public virtual int DisplayOrder { get; set; }

        /// <summary>
        /// Gets or sets the restricted countries
        /// </summary>
        public virtual ICollection<Country> RestrictedCountries
        {
            get { return _restrictedCountries ?? (_restrictedCountries = new List<Country>()); }
            protected set { _restrictedCountries = value; }
        }
    }

As you can see its called "ShippingMethod". So I get create table shippingmethod command inside script that works fine and such table is created.
But I also get ALTER TABLE ShippingMethodCountry that does not exist and should not be exist because no such class was ever created.
As I understand it is created because of private ICollection<Country>. But this alter table should point to ShippingMethod table instead (as i think).

(trying to implement mysql in nopcommerce)

Thanks.

How to repeat:
I can post full source to fileshare. But i think you can repeat it with class mentioned.

Added to changelog for 6.4.6, 6.5.5, 6.6.0: 

When using the Entity Framework Code First approach, the generated
could be incorrect: Missing length specifier for data types, such as
VARBINARY instead of VARBINARY(n). ALTER TABLE statements referring
to nonexistent tables, when private members were specified inside the
main class.