The Generator item in the Device List shows "Running" when in fact it is stopped. Also the State shows Running in the Generator menu you get to by tapping on the Generator item in the list.
The state shown in Settings / Generator start/stop menu does reflect the running state of the generator.
The generator service has a parameter /State that changes between 0 and 1 (generator stopped / running) but this does not affect what the Generator menu shows as State.
This seems to be the situation with Venus OS v2.73 and v2.89.
All stock code. Not running SetupHelper, GuiMods, etc.
Edit: disregard. Not sure what I did wrong but it's working now.