For the HTTP Request module in Automa, an error "signal is aborted without reason" is returned—why is the Fallback flow not being triggered?

For the HTTP Request module in Automa, an error "signal is aborted without reason" is returned—why is the Fallback flow not being triggered?

<img width="1373" height="345" alt="Image" src="https://github.com/user-attachments/assets/81efc351-4fa8-4fdd-9dde-a73ebfce2ba2" />