launchd items in /Library/LaunchDaemon may redirect stdin/stdout/stderr. E.g. I've got an item that says:
<key>StandardOutPath</key> <string>/Library/Logs/rnamanagedocker_out.log</string> <key>StandardErrorPath></key> <string>/Library/Logs/rnamanagedocker_err.log</string>
I do get the
/Library/Logs/rnamanagedocker_out.log, but no
/Library/Logs/rnamanagedocker_err.log is created while I am certain there is
[UPDATE Jan 17] I have now noticed that I do get stderr in an expected output file. Either I was mistaken or there was some setup I cannot reproduce that got the stderr output lost. Probably the first (picnic, problem in chair, not in computer).