That's why virtually every single p2pool UI out there doesn't show this block - they all base block finds off of accepted p2pool share chain shares. The exception is windpath's node - he scrapes the blockchain data to get the p2pool blocks regardless of whether the share that solved it is on the p2pool share chain.
Ahhhhhhh. That finally solves the mystery of "missing" blocks on alt coins with rapid blockchains.