modelBuilder.Entity<A>(aBuilder =>
        {
            aBuilder.HasKey("Id");
            aBuilder.Property<Guid>("Id");

            aBuilder.OwnsMany<B>(
                "bList",
                bBuilder =>
                {
                    bBuilder.HasKey("Id"); // Without it Ef core sets pair (AId, Id) as key but it is not needed - only one key (Id) is enough
                    bBuilder.Property<Guid>("Id");
                    bBuilder.Property<Guid>("AId").HasColumnName("AId");
                    bBuilder.WithOwner().HasForeignKey("AId");

                    bBuilder.OwnsOne<C>(b => b.C, cBuilder =>
                    {
                        cBuilder.Property<Guid>("Id");
                        cBuilder.Property<Guid>("BId").HasColumnName("BId");
                        cBuilder.WithOwner().HasForeignKey("BId");
                    });
                }
            );
        });

modelBuilder.Entity<A>(aBuilder =>
        {
            aBuilder.HasKey("Id");
            aBuilder.Property<Guid>("Id");

            aBuilder.OwnsMany<B>(
                "bList",
                bBuilder =>
                {
                    bBuilder.HasKey("Id"); // Without it Ef core sets pair (AId, Id) as key but it is not needed - only one key (Id) is enough
                    bBuilder.Property<Guid>("Id");
                    bBuilder.Property<Guid>("AId").HasColumnName("AId");
                    bBuilder.WithOwner().HasForeignKey("AId");

                    bBuilder.OwnsOne<C>(b => b.C, cBuilder =>
                    {
                        cBuilder.Property<Guid>("Id");
                        cBuilder.Property<Guid>("BId").HasColumnName("BId");
                        cBuilder.WithOwner().HasForeignKey("BId");
                    });
                }
            );
        });