MassTransit.MongoDb appears to ignore keyed IMongoClient factory when another unkeyed IMongoClient exists #6204

var services = new ServiceCollection();

services.AddKeyedSingleton<IMongoClient>("Arrow",
    (_, _) => new MongoClient("mongodb://localhost:27018/?replicaSet=rs0")); // replica set

services.AddSingleton<IMongoClient>(
    new MongoClient("mongodb://localhost:27017")); // standalone

services.AddMassTransit(x =>
{
    x.AddMongoDbOutbox(o =>
    {
        o.ClientFactory(sp => sp.GetRequiredKeyedService<IMongoClient>("Arrow"));
        o.DatabaseFactory(sp =>
        {
            var client = sp.GetRequiredKeyedService<IMongoClient>("Arrow");
            return client.GetDatabase("test_db");
        });
    });

    x.AddSagaStateMachine<SimpleSaga, SimpleSagaState>()
        .MongoDbRepository(r =>
        {
            r.ClientFactory(sp => sp.GetRequiredKeyedService<IMongoClient>("Arrow"));
            r.DatabaseFactory(sp =>
            {
                var client = sp.GetRequiredKeyedService<IMongoClient>("Arrow");
                return client.GetDatabase("test_db");
            });
        });

    x.UsingInMemory((context, cfg) =>
    {
        cfg.ReceiveEndpoint("test-queue", e =>
        {
            e.ConfigureSaga<SimpleSagaState>(context);
            e.UseMongoDbOutbox(context);
        });
    });
});