EF Core 7.0.5 model and its object property to same table

Question

I have a model in which 3 classes (part of the complete model)

public class City
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string District { get; set; }
}

public class Customer
{
    public string? Id { get; set; }
    public string? FirstName { get; set; }
    public string? LastName { get; set; }
    public City? City { get; set; }
}

public class Order
{
    public int Id { get; set; }//OrderId
    public Customer? Customer { get; set; }       
    //more properties in Customer structure
}

And the following tables:

tbl_customers
---------------------------------------------------------------------
id | customer_id | customer_first_name | customer_last_name | city_id

tbl_city
-----------------------------------------------------------
city| city_desc| dist

All the data from Order and Customer should be poured into table tbl_customers.

In Customer there is City property which mapped to foreign key to tbl_city

So, I build a Context (Instruction)

public class EntityContext: DbContext
{
        public DbSet<Order> Orders { get; set; }
        public DbSet<Customer> Customers { get; set; }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
            => optionsBuilder
                .UseSqlServer("myConnectionString");

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.Entity<City>(c =>
            {
                c.ToTable("tbl_city")
                 .HasKey(c => c.Id);

                c.Property(c => c.Id)
                 .HasColumnName("city");

                c.Property(c => c.Name)
                 .HasColumnName("city_desc");

                c.Property(c => c.District)
                 .HasColumnName("dist");
          });            

          modelBuilder.Entity<Order>(c =>
          {
                c.ToTable("tbl_customers")
                 .HasKey(c=>c.Id);
                c.Property(c=>c.Id).HasColumnName("id");
                
                c.HasOne(e => e.Customer)
                           .WithOne()
                           .HasForeignKey("customer_id");
            });

            modelBuilder.Entity<Customer>(c =>
            {
                 c.ToTable("tbl_customers");                
                c.Property(c => c.Id)
                .HasColumnName("customer_id");
                c.Property(c => c.FirstName)
                .HasColumnName("customer_first_name");
                c.Property(c => c.LastName)
                .HasColumnName("customer_last_name");
            });
        }
}

But I get an error:

System.InvalidOperationException: Cannot use table 'tbl_customers' for entity type 'Order' since it is being used for entity type 'Customer' and potentially other entity types, but there is no linking relationship. Add a foreign key to 'Order' on the primary key properties and pointing to the primary key on another entity type mapped to 'tbl_customers'.

at Microsoft.EntityFrameworkCore.Infrastructure.RelationalModelValidator.ValidateSharedTableCompatibility(IReadOnlyList1 mappedTypes, StoreObjectIdentifier& storeObject, IDiagnosticsLogger1 logger)
at Microsoft.EntityFrameworkCore.SqlServer.Infrastructure.Internal.SqlServerModelValidator.ValidateSharedTableCompatibility(IReadOnlyList1 mappedTypes, StoreObjectIdentifier& storeObject, IDiagnosticsLogger1 logger)

There is similar question without solution to the problem with different context