I would agree with you that Germany was always just using the pact as a means of buying time. Either way, it’s a fuck up of the highest order.

It’s not the exact same situation, but Germany attacking the Soviet Union in 1941 when they already had the Molotov–Ribbentrop Pact in place is a pretty colossal blunder. We don’t know what might have happened if Hitler hadn’t done that, but it was the biggest oof I’ve heard of.