Error: Definition not found, but WSDL is working

[erenirmak]

WSDL URL: https://api.ibb.gov.tr/iett/UlasimAnaVeri/HatDurakGuzergah.asmx?wsdl

Generate error:

from zeep import Client

wsdl_url = "https://api.ibb.gov.tr/iett/UlasimAnaVeri/HatDurakGuzergah.asmx?wsdl"
client = Client(wsdl=wsdl_url)

I suspect this is some kind of bug with open-source WSDL. I tried modifying WSDL via deleting headers and Client was able to process modified WSDL, but it couldn't use functions.