It was a trading day unlike any other for traders in the $25 trillion Treasury market, with a 30-year bond auction seen as having been partially undermined by a cyberattack on the U.S. unit of a Chinese bank.In recapping Treasury’s poorly received $24 billion bond auction on Thursday, traders said the weaker-than-expected results likely had at least something to do with this week’s ransomware hit on the American arm of Industrial & Commercial Bank of China, known as ICBC. That attack reportedly caused disruptions across the market and had some impact on liquidity, with the Financial Times citing unnamed sources as saying…