public class Parent
{
	public int Id { get; set; }
	public Child? Child { get; set; }
}

public class Child
{
	public int Id { get; set; }
	public required Complex Complex { get; set; }
	public bool Deleted { get; set; }
}

public class ApplicationDbContext : DbContext
{
	public DbSet<Parent> Parents { get; set; }


	public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
		: base (options)
	{
	}

	protected override void OnModelCreating(ModelBuilder modelBuilder)
	{
		base.OnModelCreating (modelBuilder);

		modelBuilder.Entity<Child> ()
		            .ComplexProperty (x => x.Complex);

		modelBuilder.Entity<Child> ().HasQueryFilter (x => !x.Deleted);
	}
}

public class Complex
{
	public MyEnum Enum { get; set; }
}
public enum MyEnum
{
	None    = 0,
	Enabled = 1,
}

var my_enum = db_context.Parents
                        .Select (p => p.Child != null ? (MyEnum?)p.Child.Complex.Enum : null)
                        .FirstOrDefault ();

Unhandled exception. System.InvalidOperationException: An error occurred while reading a database value. The expected type was 'efcore_enum_in_optional_complex_property_repro.Entites.MyEnum' but the actual value was null.
 ---> System.InvalidOperationException: The data is NULL at ordinal 0. This method can't be called on NULL values. Check using IsDBNull before calling.
   at Microsoft.Data.Sqlite.SqliteValueReader.GetInt64(Int32 ordinal)
   at Microsoft.Data.Sqlite.SqliteValueReader.GetInt32(Int32 ordinal)
   at Microsoft.Data.Sqlite.SqliteDataReader.GetInt32(Int32 ordinal)
   at lambda_method31(Closure, QueryContext, DbDataReader, ResultContext, SingleQueryResultCoordinator)
   --- End of inner exception stack trace ---
   at lambda_method31(Closure, QueryContext, DbDataReader, ResultContext, SingleQueryResultCoordinator)
   at Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryingEnumerable`1.Enumerator.MoveNext()
   at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Boolean& found)
   at lambda_method32(Closure, QueryContext)
   at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.Execute[TResult](Expression query)
   at Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryProvider.Execute[TResult](Expression expression)
   at System.Linq.Queryable.FirstOrDefault[TSource](IQueryable`1 source)
   at Program.<<Main>$>g__Act|0_2(<>c__DisplayClass0_0&) in %path-to-repos%\efcore-enum-in-optional-complex-property-with-queryfilter-repro\efcore-enum-in-optional-complex-property-repro\Program.cs:line 49
   at Program.<Main>$(String[] args) in %path-to-repos%\efcore-enum-in-optional-complex-property-with-queryfilter-repro\efcore-enum-in-optional-complex-property-repro\Program.cs:line 12