Task 64888994827

validation: fix UB in `LoadChainTip`

2026-02-25 19:25:45 completed 2026/02/fix-ub-LoadChainTip cd2d6529f49dfef98ecc89c0d07b2ba0ac55a550

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[meta] record frozen commit

2026/02/fix-ub-LoadChainTip