During our testing, we found that the latest stable SDK is not working with our PoC6 testnet. As a result, we are urgently shipping a bugfix update for it. The issue lies in its connection to an unavailable PRuntime node. This problem also existed in previous versions of the SDK unless you specified the PRuntime to connect to. We recommended you upgrading @phala/sdk to 0.5.5 to make it functional. Also, please update @phala/fn to version 0.2.4 as it is also affected by the same issue.