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If this was an intentional attack, the attacker is certainly clever, but without clear motivation. Perhaps there was some sunk cost after watching our attempts to patch this issue. They may have wanted to trigger their attack this bug while they still could cause some harmbefore a release. A As a reminder, halting bugs of this severity are eligible for the EF Bug Bounty program. The deployer could have earned at thousands in USD bounty for this finding. More importantly their discovery could be celebrated publicly and earn the goodwill of client teams and the ethereum ecosystem. The rewards of cooperation are better in this case certainly.
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