Stream Add with auto-generated ID is 5 seconds old

For some reason StreamAdd() and StreamAddAsync() when using auto-generated IDs are generating IDs from a Unix time milliseconds value that are roughly ~5s old.

Redis is running in docker:

docker run -d --restart always -p 6379:6379 redis

Sample application:

using System;
using System.Globalization;
using StackExchange.Redis;

using var redis = await ConnectionMultiplexer.ConnectAsync("localhost:6379");
var db = redis.GetDatabase();
             
Console.WriteLine($"Writing record at {DateTimeOffset.UtcNow}");
var result = await db.StreamAddAsync("test", "test", DateTime.UtcNow.ToString(CultureInfo.InvariantCulture));
var millis = long.Parse(result.ToString().Split('-')[0]);
Console.WriteLine($"Wrote record '{result}' ({DateTimeOffset.FromUnixTimeMilliseconds(millis)}) at {DateTimeOffset.UtcNow}");

Sample output:

Writing record at 27/08/2021 12:36:25 AM +00:00
Wrote record '1630024580206-0' (27/08/2021 12:36:20 AM +00:00) to redis stream 'test' at 27/08/2021 12:36:25 AM +00:00

I did not have the same issue when calling XADD via the Redis CLI.

Start with the StreamAdd and StreamAddAsync paths that generate IDs when no explicit ID is supplied, using the C# sample application to reproduce the timestamp discrepancy. Compare the generated ID with the current Unix time and with Redis CLI XADD behavior; done means auto-generated IDs no longer appear roughly five seconds old.