When splitting_pdf_page is started, only the last set of API requests can succeed.

Describe the bug
When I set split_pdf_page=True,split_pdf_concurrency_level=15.
Assuming the pdf is divided into 10 sets, it will report an error:
ERROR: Failed to send request for page 1
...
WARNING: Failed to partition set Unstructured-IO/unstructured-api#1, its elements will be omitted in the final result.
...
WARNING: Failed to partition set Unstructured-IO/unstructured-api#9, its elements will be omitted in the final result.
INFO: Successfully partitioned set Unstructured-IO/unstructured-api#10, elements added to the final result.

To Reproduce
code:

import os, json

import requests
from unstructured_client.models.operations import PartitionRequest
from unstructured_client.models.shared import PartitionParameters, ChunkingStrategy

os.environ["UNSTRUCTURED_API_KEY"] = "EMPTY"
os.environ["UNSTRUCTURED_API_URL"] = ""

import unstructured_client
from unstructured_client.models import shared, operations

requests_client = requests.Session()
client = unstructured_client.UnstructuredClient(
    api_key_auth=os.getenv("UNSTRUCTURED_API_KEY"),
    server_url=os.getenv("UNSTRUCTURED_API_URL"),
    client=requests_client
)

filename = "./test_pdf.pdf"

file = open(filename, "rb")
req = operations.PartitionRequest(
    partition_parameters=shared.PartitionParameters(
        files=shared.Files(
            content=file.read(),
            file_name=filename,
        ),
        strategy=shared.Strategy.HI_RES,
        split_pdf_page=True,
        split_pdf_concurrency_level=15,
        chunking_strategy=ChunkingStrategy("by_title")
    )
)

try:
    res = client.general.partition(req)
    element_dicts = [element for element in res.elements]

    print(element_dicts)
    for e in element_dicts:
        print(e['text'])
except Exception as e:
    print(e)

Console Information：

INFO: Preparing to split document for partition.
INFO: Concurrency level set to 15
INFO: Splitting pages 1 to 23 (23 total)
INFO: Determined optimal split size of 2 pages.
INFO: Partitioning 11 files with 2 page(s) each.
INFO: Partitioning 1 file with 1 page(s).
INFO: Partitioning set Unstructured-IO/unstructured-api#1 (pages 1-2).
INFO: Partitioning set Unstructured-IO/unstructured-api#2 (pages 3-4).
INFO: Partitioning set Unstructured-IO/unstructured-api#3 (pages 5-6).
INFO: Partitioning set Unstructured-IO/unstructured-api#4 (pages 7-8).
INFO: Partitioning set Unstructured-IO/unstructured-api#5 (pages 9-10).
INFO: Partitioning set Unstructured-IO/unstructured-api#6 (pages 11-12).
INFO: Partitioning set Unstructured-IO/unstructured-api#7 (pages 13-14).
INFO: Partitioning set Unstructured-IO/unstructured-api#8 (pages 15-16).
INFO: Partitioning set Unstructured-IO/unstructured-api#9 (pages 17-18).
INFO: Partitioning set Unstructured-IO/unstructured-api#10 (pages 19-20).
INFO: Partitioning set Unstructured-IO/unstructured-api#11 (pages 21-22).
INFO: Partitioning set Unstructured-IO/unstructured-api#12 (pages 23-23).
ERROR: Failed to send request for page 1
ERROR: Failed to send request for page 3
ERROR: Failed to send request for page 5
ERROR: Failed to send request for page 7
ERROR: Failed to send request for page 9
ERROR: Failed to send request for page 11
ERROR: Failed to send request for page 13
ERROR: Failed to send request for page 15
ERROR: Failed to send request for page 17
ERROR: Failed to send request for page 19
ERROR: Failed to send request for page 21
WARNING: Failed to partition set Unstructured-IO/unstructured-api#1, its elements will be omitted in the final result.
WARNING: Failed to partition set Unstructured-IO/unstructured-api#2, its elements will be omitted in the final result.
WARNING: Failed to partition set Unstructured-IO/unstructured-api#3, its elements will be omitted in the final result.
WARNING: Failed to partition set Unstructured-IO/unstructured-api#4, its elements will be omitted in the final result.
WARNING: Failed to partition set Unstructured-IO/unstructured-api#5, its elements will be omitted in the final result.
WARNING: Failed to partition set Unstructured-IO/unstructured-api#6, its elements will be omitted in the final result.
WARNING: Failed to partition set Unstructured-IO/unstructured-api#7, its elements will be omitted in the final result.
WARNING: Failed to partition set Unstructured-IO/unstructured-api#8, its elements will be omitted in the final result.
WARNING: Failed to partition set Unstructured-IO/unstructured-api#9, its elements will be omitted in the final result.
WARNING: Failed to partition set Unstructured-IO/unstructured-api#10, its elements will be omitted in the final result.
WARNING: Failed to partition set Unstructured-IO/unstructured-api#11, its elements will be omitted in the final result.
INFO: Successfully partitioned set Unstructured-IO/unstructured-api#12, elements added to the final result.
INFO: Successfully partitioned the document.

Bắt đầu từ client.general.partition và theo dõi cách xử lý split_pdf_page, split_pdf_concurrency_level và các request theo từng trang được hiển thị trong reproduction. Chạy ví dụ 23 trang được cung cấp và kiểm tra vì sao các tập request trước đó thất bại trong khi tập cuối cùng thành công. Hoàn tất khi tất cả các tập đã được phân vùng hoàn thành thành công và các phần tử của chúng được đưa vào kết quả cuối cùng.