How to debug Cloud? "An unknown error occurred"

[COWI-MI]

Running Codex in cloud end with an error. Is there any way to find the cause?

Example
run a small test to see if you can add a PR. The last few Codex cloud runs failed with "An unknown error occurred"

End of log:

Status:

UPDATE: it just started working again. Still it would be nice to get more info on why a task fails.