var results = context.Set<Employee>()
    .Select(e => EF.Property<string>(e, "Title"))
    .ToList();

Unhandled exception. System.NullReferenceException: Object reference not set to an instance of an object.
   at MongoDB.EntityFrameworkCore.Query.Visitors.MongoProjectionBindingExpressionVisitor.MatchTypes(Expression expression, Type targetType)
   at MongoDB.EntityFrameworkCore.Query.Visitors.MongoProjectionBindingExpressionVisitor.Translate(MongoQueryExpression queryExpression, Expression expression)
   at MongoDB.EntityFrameworkCore.Query.Visitors.MongoQueryableMethodTranslatingExpressionVisitor.TranslateSelect(ShapedQueryExpression source, LambdaExpression selector)
   at Microsoft.EntityFrameworkCore.Query.QueryableMethodTranslatingExpressionVisitor.VisitMethodCall(MethodCallExpression methodCallExpression)
   at MongoDB.EntityFrameworkCore.Query.Visitors.MongoQueryableMethodTranslatingExpressionVisitor.VisitMethodCall(MethodCallExpression methodCallExpression)
   at MongoDB.EntityFrameworkCore.Query.Visitors.MongoQueryableMethodTranslatingExpressionVisitor.Visit(Expression expression)
   at MongoDB.EntityFrameworkCore.Query.MongoQueryCompilationContext.CreateQueryExecutor[TResult](Expression originalQuery)
   at Microsoft.EntityFrameworkCore.Storage.Database.CompileQuery[TResult](Expression query, Boolean async)
   at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.CompileQueryCore[TResult](IDatabase database, Expression query, IModel model, Boolean async)
   at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.<>c__DisplayClass11_0`1.<ExecuteCore>b__0()
   at Microsoft.EntityFrameworkCore.Query.Internal.CompiledQueryCache.GetOrAddQuery[TResult](Object cacheKey, Func`1 compiler)
   at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.ExecuteCore[TResult](Expression query, Boolean async, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.Execute[TResult](Expression query)
   at Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryProvider.Execute[TResult](Expression expression)
   at Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryable`1.GetEnumerator()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at Program.<Main>$(String[] args) in /Users/arthur.vickers/code/OnYourOwnNow/OnYourOwnNow/Program.cs:line 19

using var context = new SomeDbContext();

context.Database.EnsureDeleted();

context.AddRange(
    new Employee
        { EmployeeID = 10, City = "Walpole", ReportsTo = 1, Country = "UK", FirstName = "Baxter", Title = "Sales Representative" });
context.SaveChanges();

var results = context.Set<Employee>()
    .Select(e => EF.Property<string>(e, "Title"))
    .ToList();
    
foreach (var result in results)
{
    Console.WriteLine($"Found {result}");
}

public class SomeDbContext : DbContext
{
    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder) 
        => optionsBuilder
            .UseMongoDB("mongodb://localhost:27017", "SomeDb2")
            .LogTo(Console.WriteLine, LogLevel.Information);

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Employee>().ToCollection("Employees");
    }
}

public class Employee
{
    public int EmployeeID { get; set; }

    [MaxLength(10)] [Required] public string FirstName { get; set; }

    [MaxLength(30)] public string Title { get; set; }

    [MaxLength(15)] public string City { get; set; }

    [MaxLength(15)] public string Country { get; set; }

    public int? ReportsTo { get; set; }
}