How does Error Boundary Event on a task work in Onify?

I'm looking at a BPMN flow with 11 tasks with onifyApiRequest and 6 of them has got an "Error Boundary Event"-marker on them. There is no added information in the panel for any of them. I assume if there is some error in one of them this flow will just jump to the End?

For what type of errors will this happen - anything else than a statuscode 200? Is it configurable?

Is any of the additional fields usable in Onify?