Legacy State Corruption

Legacy state corruption refers to the unintentional alteration or loss of historical protocol data during the migration process. This often occurs if the migration script fails to properly read the original state or if it attempts to write to the new contract while still interacting with the old one, leading to race conditions.

If the legacy state is corrupted, it may become impossible to verify historical transactions or user balances. This is a significant risk for protocols that rely on historical data for calculating rewards or governance power.

Preventing this requires a read-only approach to the legacy state and rigorous validation of the new state before the migration is considered finalized and the old contract is deprecated.