Push opeartion failed if push and upsert for same document were built into same BulkOperation execution

BulkOperationBuilder p_builder p_builder.find(queryObj).upsert().updateOne(BSON("$set"<<bsonObj_1)); p_builder.find(queryObj).update(BSON("$push"<<bsonObj_2)); p_builder.execute() If both query hit same document, the push operation didn't create the array correctly. If move push operation away from bulkOperationBuilder and run it in the non-bulk mode, the array field was created correctly. Moreover, even push operation failed in the bulkOpeation mode, there is no exception raised for the bulkOperation.execute().