https://www.wikifunctions.org/view/en/Z16424 was edited two hours ago and seems to have worked then, but not now, which is after the train this week, so I don't think that's at fault, and we've not (and no one else has) made any changes to prod since then.
First apparent failure is from 18:36, on https://www.wikifunctions.org/view/en/Z16430. It looks like the Type serialisation is failing in that case? 'Could not serialize input Python object: 3'.