EF Core migration generation issue

BranchContext.cs

using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata.Builders;

namespace Experiment.Lib
{
    public sealed class BranchContext : DbContext
    {
        public DbSet<Order> Orders { get; set; }
        
        // Uncommenting this causes a different migration to be generated.
        //public DbSet<Vehicle> Vehicles { get; set; }

        protected override void OnConfiguring(DbContextOptionsBuilder options)
        {
            options.UseSqlServer("foo");
        }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.Entity<Order>(MapToViewOwningVehicle); // Fails with NullReferenceException
            //modelBuilder.Entity<Order>(MapToViewWithKeys); // Okay
            //modelBuilder.Entity<Order>(MapToViewNotOwningVehicle); // Okay
            //modelBuilder.Entity<Order>(MapToTableOwningVehicle); // Okay
        }

        private static void MapToViewOwningVehicle(EntityTypeBuilder<Order> builder)
        {
            builder.ToView("vw_OrderStatus_Orders");
            builder.OwnsOne(o => o.Vehicle);
        }

        private static void MapToViewWithKeys(EntityTypeBuilder<Order> builder)
        {
            builder.ToView("vw_OrderStatus_Orders");
            builder.HasKey(o => o.OrderId);
            builder.OwnsOne(o => o.Vehicle, vb => vb.HasKey(v => v.Id));
        }

        private static void MapToViewNotOwningVehicle(EntityTypeBuilder<Order> builder)
        {
            builder.ToView("vw_OrderStatus_Orders");
        }

        private static void MapToTableOwningVehicle(EntityTypeBuilder<Order> builder)
        {
            builder.ToTable("vw_OrderStatus_Orders");
            builder.OwnsOne(o => o.Vehicle);
        }
    }
}

Order.cs

namespace Experiment.Lib
{
    public class Order
    {
        public int OrderId { get; set; }
        public Vehicle Vehicle { get; set; }
    }
}

Vehicle.cs

namespace Experiment.Lib
{
    public class Vehicle
    {
        public int Id { get; set; }
    }
}

The comment where it says it will migrate elsewhere can be changed.