Theres no check that the old address isnt the same as the new address, and theres no check that the migration has already happened
There is 1 instance of this issue:
https://github.com/code-423n4/2022-05-backd/blob/2a5664d35cde5b036074edef3c1369b984d10010/protocol/contracts/zaps/PoolMigrationZap.sol#L52-L58
