Two new_session.session files created

In 2.3.16, on use of the 'New session' button, two instances of new_session.session are seen. Why is this?

<img width="550" height="212" alt="Image" src="https://github.com/user-attachments/assets/c3d676d7-2efa-4e93-bdb2-f22526821b9a" />