Ethereum developers postponed the Glamsterdam upgrade on the Hoodi testnet after security researchers identified gas-accounting risks affecting smart contracts.

From the articleEthereum Glamsterdam Delay: ChainSecurity Flags 13 Contracts Where Failures Turn PermanentAlso in Ethereum Delays Oct 26 Glamsterdam Hoodi Upgrade Over Security Risks, Ethereum Delays Glamsterdam Upgrade After Security Researchers Flag Risks, Ethereum's long-awaited Glamsterdam upgrade hits another roadblock as 13 security risks emerge, Ethereum Delays Glamsterdam Testnet Fork Over Gas Security Flaws - Decrypt, Ethereum Glamsterdam Upgrade Delayed Over Security Risks, Ethereum Delays Glamsterdam Testing After 13 Contracts Trigger Concerns, Ethereum delays Glamsterdam test after security devs flag risk to existing contracts, Ethereum postpones Glamsterdam upgrade on Hoodi testnet over smart contract concerns