Summary

When attempting to run the code below a NullReferenceException is thrown

Driver: 2.24.0

How to Reproduce

Run the following test:

_public class MongoTest
{
    [Fact]
    public async Task Test()
    {
        var settings = MongoClientSettings.FromConnectionString("

");
        settings.ServerApi = new ServerApi(ServerApiVersion.V1);
        settings.LinqProvider = MongoDB.Driver.Linq.LinqProvider.V3;        var mongoClient = new MongoClient(settings);        var db = mongoClient.GetDatabase("DB");        var collection = db.GetCollection<Record>(nameof(Record));        var result = await collection.UpdateOneAsync(
            Builders<Record>.Filter.Empty,
            Builders<Record>.Update.Pipeline(PipelineDefinitionBuilder.For<Record>()
                .Set(record => new Record
                {
                    DurationInMinutes = DateTime.UtcNow.Subtract(record.StartTime, DateTimeUnit.Minute)
                })));
    }    private class Record
    {
        public DateTime StartTime

        public double DurationInMinutes { get; set; }
    }
}_

Additional Background

Please provide any additional background information that may be helpful in diagnosing the bug.