I'm looking into it. For example, I can tell you that I had four characters total, all in the mansion, one upgrading to the first level of Tailoring module, one fishing, one smithing an axe with a hunting knife queued, and one cooking meat soups with a single unit of bread queued. I advance time, and this happens:
SCRIPT ERROR: Invalid get index 'id' (on base: 'Nil').
at: build_location_group (res://gui_modules/Exploration/Scripts/ExplorationModule.gd:530) - Invalid get index 'id' (on base: 'Nil').
Ok, I reload, advance time again, and the same thing happens. During that turn, the Tailor upgrade was not completed. The fishing continued. The axe was made, but the hunting knife was not. The cook finished meat soups and the bread and was left with nothing to do.
It says 'Exploration module', but I'm not out exploring, so maybe it's the cook running out of work? I reload again, same thing happens, three times I reload, same error.
But then I exit the game, reload to the same save, advance time, and there is no error. That isn't the only time I've 'lost' an error that way.
I will keep looking, but I can say for certain that some errors do not appear in the log from a fresh game start that would if you had been playing through.