PyRFC failing in server example server_app_thread.py

[Vartu]

Describe the bug
Running function module STFC_STRUCTURE from SAP using RFC to PyRFC-based server ends with exception "SYSTEM_FAILURE" and kills the running PyRFC server. I used the example script server_app_thread.py for testing.

To Reproduce
Run python script server_app_thread.py with fitting sapnwrfc.ini configuration. On the connected SAP system run function module STFC_STRUCTURE with empty fields with RFC target being the registered program RFC created by the Python script.

Screenshots

Environment

• OS: Windows Server 2022 Datacenter
• Running in docker? No.
• PyRFC version: 3.3.1
• NW RFC SDK version: 7.50.13
• Python version: 3.12.3

Additional context
The SAP system is S/4HANA 2022.

Here's the relevant traces:
pyrfc_failure_traces.zip