Recently, Lane Rettig, an independent core developer of Ethereum [ETH] posted a “post-mortem” report and his concerns regarding the Constantinople hard fork on Ropsten Testnet. The report covered the various issues discovered during the hard fork, which was set to be implemented by the end of October 2018.
According to the report, a consensus bug was discovered in Parity implementation of Ethereum. He explained the reasons why the bug was not discovered by the Ethereum testers and why the consensus bug occurred. Rettig added:
https://ambcrypto.com/ethereum-eth-ropsten-constantinople-hard-fork-issues-unveiled-by-core-developer/