I’m not involved in the polygon team at all, but just leave some comments.
It just seems like a terrible luck. Polygon pos chain is relying on probabilistic consensus.
As you mentioned about the hard fork, sprint length was decreased from 64 to 16 which means that the probability of long reorg is decreased that much.
However, that’s just probability and still the chain can produce this kind of long reorg even with very little probability.
This kind of bad finality is definitely a problem, and it needs some investigation and fix for this.
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