A new revealProblems property is available in the presentation of tasks in tasks.json in current Insider's builds / the upcoming 1.34. However, this property is absent from the TaskPresentationOptions API in vscode.d.ts, even though historically, new options were always added there. It also doesn't seem to be respected when you ignore the type declaration and set the property via the tasks API anyway.
Is this intentional, or simply an oversight?