In mongodb/mongo-php-driver#1763 (PHPC-2478), andreas.braun@mongodb.com pointed out that an unlikely failure of php_phongo_zval_to_bson() to populate bson_out for PHONGO_BSON_RETURN_ID would result in throwing an exception after the document was already appended to the bulk write.

That code for BulkWriteCommand::insertOne() was modeled after existing code in BulkWrite::insert(), so this ticket can serve to address the original logic in BulkWrite::insert().