Inserting 100,000 writes using bulkWrite, w:0, and ordered:false to a new collection appears to consistently insert only 99,999 on a sharded cluster.

Details
Trying to determine why, I saw mongos logs the following many times:

{"t":{"$date":"2024-10-04T09:44:32.144-04:00"},"s":"I",  "c":"SHARDING", "id":8037203, "svc":"R", "ctx":"conn43","msg":"Noting cannotImplicitlyCreateCollection response.","attr":{"status":{"code":227,"codeName":"CannotImplicitlyCreateCollection","errmsg":"Implicit collection creation on a sharded cluster must go through the CreateCollectionCoordinator","ns":"db.test"}}}

The test appears to pass (all 100,000 documents reported) in any of these scenarios:

• If the collection is created first.
• With the insert command.
• With ordered:true.
• With w:1.
• With a replica set.