Under EIP-8037, gas restored during execution allows contracts designed around older rules to complete failure-handling instructions instead of cleanly reverting.

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