DbContext.Database.EnsureCreated() for model with multiple indexed properties throws ArgumentException

[ArtemMihailov]

We have a model which needs several indexed properties. If we are using DbContext.Database.EnsureCreated() for context with such model it throws ArgumentException. If we create/migrate DB manually, adding/querying with several indexed properties are working as expected.

Exception message: An item with the same key has already been added. Key: System.Object Item [System.String]
Stack trace: 
{System.ArgumentException: An item with the same key has already been added. Key: System.Object Item [System.String]
   at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)
   at Microsoft.EntityFrameworkCore.Migrations.Internal.MigrationsModelDiffer.GetSortedProperties(IEntityType entityType) in /_/src/EFCore.Relational/Migrations/Internal/MigrationsModelDiffer.cs:line 647
   at Microsoft.EntityFrameworkCore.Migrations.Internal.MigrationsModelDiffer.GetSortedProperties(TableMapping target) in /_/src/EFCore.Relational/Migrations/Internal/MigrationsModelDiffer.cs:line 595
   at Microsoft.EntityFrameworkCore.Migrations.Internal.MigrationsModelDiffer.Add(TableMapping target, DiffContext diffContext)+MoveNext() in /_/src/EFCore.Relational/Migrations/Internal/MigrationsModelDiffer.cs:line 552
   at System.Linq.Enumerable.SelectManySingleSelectorIterator`2.MoveNext()
   at System.Linq.Enumerable.ConcatIterator`1.MoveNext()
   at Microsoft.EntityFrameworkCore.Migrations.Internal.MigrationsModelDiffer.Sort(IEnumerable`1 operations, DiffContext diffContext) in /_/src/EFCore.Relational/Migrations/Internal/MigrationsModelDiffer.cs:line 144
   at Microsoft.EntityFrameworkCore.Storage.RelationalDatabaseCreator.GetCreateTablesCommands() in /_/src/EFCore.Relational/Storage/RelationalDatabaseCreator.cs:line 134
   at Microsoft.EntityFrameworkCore.Storage.RelationalDatabaseCreator.CreateTables() in /_/src/EFCore.Relational/Storage/RelationalDatabaseCreator.cs:line 116
   at Microsoft.EntityFrameworkCore.Storage.RelationalDatabaseCreator.EnsureCreated() in /_/src/EFCore.Relational/Storage/RelationalDatabaseCreator.cs:line 226
   at ConsoleApp1.Program.Main() in C:\source\repos\ConsoleApp1\ConsoleApp1\Program.cs:line 60}

Steps to reproduce

using System;
using System.Collections.Generic;
using Microsoft.EntityFrameworkCore;

namespace ConsoleApp1
{
    public class IdentityUser
    {
        public int Id { get; set; }

        public object this[string indexedPropertyName]
        {
            get
            {
                if (this.customValues.ContainsKey(indexedPropertyName))
                {
                    return this.customValues[indexedPropertyName];
                }

                return null;
            }

            set => this.customValues.Add(indexedPropertyName, value);
        }

        private readonly Dictionary<string, object> customValues = new Dictionary<string, object>();
    }

    public class BloggingContext : DbContext
    {
        public DbSet<IdentityUser> Users { get; set; }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            optionsBuilder
                .UseSqlServer(@"Server=(localdb)\mssqllocaldb;Database=Test;ConnectRetryCount=0");
        }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.Entity<IdentityUser>(
                d =>
                {
                    d.Metadata.AddIndexedProperty("Field1", typeof(decimal));
                    d.Metadata.AddIndexedProperty("Field2", typeof(Guid));
                });

            base.OnModelCreating(modelBuilder);
        }
    }

    public class Program
    {
        public static void Main()
        {
            using (var context = new BloggingContext())
            {
                context.Database.EnsureDeleted();
                context.Database.EnsureCreated();
            }
        }
    }
}

Further technical details

EF Core version: 3.0.0-preview.19074.3
Database Provider: Microsoft.EntityFrameworkCore.SqlServer
Operating system: Windows 10 1809
IDE: Visual Studio 2017 15.9.7