~CursorStage() is called every time when

• there is an exception in exec::agg::buildPipeline(qoPipeline) and
• qoPipeline contains DocumentSourceCursor stage.

Since the QE pipeline is created only at the end of exec::agg::buildPipeline(qoPipeline), the already-created stages like CursorStage are not auto-disposed, so the tassert() in ~CursorStage will always fail causing the process termination.

One way to resolve this is to add auto-dispose to the individual stages.