OtOpcUa's out-of-process script runner publishes 0x80040000 with a null value.
- OpcUaDataConnection: logs entry/recovery once per tag, names the symbolic
status in read errors; never a disconnect (not in the reconnect status set).
- InstanceActor: a Bad update with no value is a quality-only transition
(keep value, quality Bad, stream publish, no script/alarm/waiter re-eval),
matching the connection-drop rule. Bad with a value is unchanged.
Claude-Session: https://claude.ai/code/session_01GT67AEHd2Acv1YPwGfXEoV
Joseph Doherty