Модуль python os не переименовывает файл, даже если файл существует — os.rename(src, dst)

Я пытаюсь переименовать файлы из каталога. Но по какой-то неизвестной мне причине файлы не переименовываются.

Код:

def extract_info_from_filename(file_name):
    parts = file_name.split('Z')
    part1 = parts[0]
    part2 = parts[1]
    
    return part1, part2

def find_csv_files_to_rename(directory):
    for root, dirs, files in os.walk(directory):
        if 'rename' in root:
            for file_name in files:
                if file_name.endswith('.csv'):
                    original_file_path = root + '/' + file_name
                    print(f"File Name: {file_name}, Extracted Info: {extract_info_from_filename(file_name)}")
                    extracted_parts = extract_info_from_filename(file_name)
                    new_file_name = f"{extracted_parts[0]}Z_treatment{extracted_parts[1]}"
                    print(f"New File name: {new_file_name}")
                    #new_file_path = os.path.join(root,new_file_name)
                    new_file_path =root+'/'+new_file_name
                    print(f"New File Path Exists: {os.path.exists(new_file_path)}")
                    print(f"Original File Path Exists: {os.path.exists(original_file_path)}")
                    print(f"Root: {root}")
                    print(f"New file path: {new_file_path}")
                    if not os.path.exists(new_file_path):        
                        os.rename(original_file_path, new_file_path)
                        if os.rename(original_file_path, new_file_path):
                            print(f'Renamed: {file_name} -> {new_file_name} \n')
                    else:
                        print(f'File already exists: {original_file_path} \n')


root_directory = 'input_files'
find_csv_files_to_rename(root_directory)

Выход:

File Name: 2023-07-08T00_28_04_750Z_Aachen_01.01.2022-P06.2023.csv, Extracted Info: ('2023-07-08T00_28_04_750', '_Aachen_01.01.2022-P06.2023.csv')
New File name: 2023-07-08T00_28_04_750Z_treatment_Aachen_01.01.2022-P06.2023.csv
New File Path Exists: False
Original File Path Exists: False
Root: input_files\rename_and_validate\XXXX\year=2023\month=07\day=08\XXXX
New file path: input_files\rename_and_validate\XXXX\year=2023\month=07\day=08\XXXX/2023-07-08T00_28_04_750Z_treatment_Aachen_01.01.2022-P06.2023.csv

Ошибка:

FileNotFoundError: [WinError 3] The system cannot find the path specified: 'input_files\\rename_and_validate\\XXXX\\year=2023\\month=07\\day=08\\XXXX/2023-07-08T00_28_04_750Z_Aachen_01.01.2022-P06.2023.csv' -> 'input_files\\rename_and_validate\\XXXX\\year=2023\\month=07\\day=08\\XXXX/2023-07-08T00_28_04_750Z_treatment_Aachen_01.01.2022-P06.2023.csv'

Я любезно хочу знать решение. Я испробовал все возможные способы решения проблемы, начиная с изменения путей (с использованием функции .join). Но похоже та же проблема.