Bugs? I'll bet they are using the same alloy as the rest of the engine line and the limit of strength has been reached here. To use a more expensive alloy would certainly raise the price of the engine.
This being a chinese engine built to a price point, I doubt they will bother to make a better crankshaft for it. I think it more lkely that a chinese engine running on the edge of failure would more likely be detuned by the mfgr to keep them from failing and having to pay warranty claims.

Just my opinion......