`[Errno 32] Broken pipe` and `[Errno 111] Connection refused` in logs are root cause. is sat still accessible for you?
if yes, then it's probably a bug in handling multiple sessions at the same time, i'll look at that later
quick suggestion is to try the same scenario without nested sessions - unpriviledged_session, then admin session
if that case will work - definitely a bug in nested sessions
Having this test:
but same thing when the sessions are nested, it does not work: