I've found these situations to be no-win.

When I had reasonable certainty of my next gig being lined up, I even put the question to leaders. "If I tell you why this project is destined to failure now in Q1 vs being quiet and playing along til end of year, will I be rewarded or punished any differently then?".

The response was 100% nervous laughter. It turned out both layers of management above me were also well aware the marching order they were passing along were going to end badly, and had already lined up their internal transfers, which happened within days of my departure as well.